Seems like those ultrasonic devices are just providing the mice with some soothing techno music while they dine.

I’ve watched maybe 20-30 videos reviewing these things & sir yours is the best. You were cut & dry to the point. Also, you obviously weren’t trying to sell a product. I’m beginning to hate YT because you never know who is trying to promote their product & who is doing genuine scientific research. For that, thank you!

If you pay me what you paid for those bogus electronic sound shooters I'll stand there and yell in a designated location for a little while.

Mouse: "That really hurts my ears"! See's almond butter.... Mouse: WORTH IT!

this wasn't what I was looking for actually but I have to give you props for being well equipped and professionally made a video with the pest control.

For the decibel reader, you might want to remove the foam screen cap. Thats there to prevent wind screen noise, but as you are indoors, would be entirely unnecessary, and at the range of sound you are recording, that foam screen cap may very well perform as an acoustic absorber. Also dB's are a non linear scale, 20 dB's is an extraordinary amount of energy, even an increase of 1 dB in the upper level is quite a significant and almost unsafe amount of energy. Also another thing is that High frequency noises are **extremely** directional. If your sensor is place even a little off access, you will get a significant decrease in decibel reading, this is part of the secret of how directional mics work to begin with.... which is another reason why emitters are ineffective. This speaks volumes that rodents will straight up eat within a choir of them. Good on you for exposing the fallacious industry of these sonic emitters.

If you look close, you can see that the mouse has ear plugs on.

Thank you for providing us with your priceless public service. I was tempted to buy one of these things, and you've saved me some money.

It makes me so angry that these things are still being sold and they don’t work. Where are the consumer protection agencies banning these devices and suing for false clams.

Thank you. You saved me some money. I can't believe companies are allowed to sell the public such junk!

Frequency is measured in Hertz and Decibel is in pressure level (SPL), I don't believe we can use the db reader to detect the frequency of the sound.

Its shocking to me that Walmart, Home depot and many other reputable stores still sell that nonsense. I have used them several times. They absolutely DO NOT WORK!! ITS A TOTAL WASTE OF MONEY!!

They work best if you wind up and throw it at them and are lucky enough to hit them.

you got a deaf mouse. lol

I adopted a stray cat... I don't have any mice anymore....

I’m just going to burn the house down 🤷🏽‍♂️

Thank you for taking the time to check these out and the trail cam footage.

As others have said the dB output is not cumulative. This means the "dead" repellers may actually be emitting sound; only below the ambient level (which seems not very much). Either way, I am convinced of the ineffectiveness of these devices. Pictures don't lie.

Excellent video! I've been thinking about getting one but was concerned that it might affect my cat. Now I see that it doesn't affect anything at all. Thank you.

Hey Amigo thanks for the effort you put into this. Most of what I read says that these ultrasonic devices don't provide much assistance in repelling mice for various reasons--placement, gradual acclimation to the sound produced, etc. I wonder though how accurately a standard db meter can detect volume( or more correctly sound pressure level-SPL). Decibel meters seem to be aimed at measuring the SPL of frequencies that humans can hear (20hz to 20,000 hz) to aid in the prevention damage to human hearing in noisy environments. Measuring the sound pressure level of frequencies beyond that range( so called ultrasonic) probably requires a different instrument. Perhaps the one repellent device that seemed to be "working" was emitting a frequency that the meter could detect. No criticism intended here just some fun musing. The bottom line is the little buggers are winning.

those companies should be sued for scamming us

I’ve never used one for mice, but I had a really REALLY REALLY bad cockroach infection that came from a neighboring apartment. I paid $10 on Amazon fairly positive it was a scam, I couldn’t use a spray for atleast 2 days and Amazon would deliver the device next day and the spray the day after. I received it and plugged it in at the worst point of infection where they make the most contact with me. Their numbers were greatly reduced and they didn’t come too close to me. I had to use it at the highest setting which was audible to me and annoying af to my dog but it worked. Finally the spray arrived and I was able to keep them at bay out if my apartment until an exterminator took care of the whole building.

Mouse: You telling me I fought my way through a Taylor Swift concert for some crapass Almond Butter?

You can 'expect' the pest repellerto work well if it has the ability to change the frequency of sounds that it emits. This is because mice and rodents are not used to changing frequencies, and therefore might get irritated due to it. The high frequency sounddoes not work if it encounters a solid obstacle in its way...

The problem is that decibels don't measure frequency. Decibels are used to measure volume. FREQUENCY measure the number of times a sound wave passes a fixed point. Sound comes in waves and the number of times each second a new wave passes a point is the FREQUENCY of the sound.

This also depends on the detector response range. If the detector itself does not respond to that frequency, it may showing a fault result

They recommend one for each room. Bedroom #1, Bedroom Closet #1, Bedroom #2, Bedroom closet #2, Bedroom #3, Bedroom Closet #3, Bathroom #1, Bathroom #2, Powder Room, Living Room, Dining Room, Den, Kitchen, Crawlspace, Attic, and One for EACH Hallway, Stairway #1, Stairway #2, Stairway #3, Tool Shed, Garage, Front Porch, Back Yard Porch, Sun Porch, Front Yard, Back Yard, Side Yard #1, and Side Yard #2. Once installed with just 28 electronic you WILL be Protected from Bigfoot’s 🦧, UFOs 🛸, Dinosaurs 🦕, Aliens 👽, Do-Do Birds 🦤, Wooly Mammoths 🦣, Giant Squids 🦑, Giant Tree Sloths 🦥, Blue Whales 🐋, Red Pixies 🧚‍♀️, Green Pixies 🧚, Giant Turtles 🐢, Land Sharks 🦈, Dragons 🐉, and Most Invasive Extinct Species!!!! Money Back Guaranteed* *Photo Required

I was told by a restaurant owner that the ultra sonic rat and roach killers do not work, back in 1985, after seeing a cockroach run across one of the devices. Total FAIL!!! Then 2 years ago I heard about using 432htz to calm down the brain and produce sleep. I was using my phone to send the sound to my stereo, which made it much louder, so 432htz worked, when amplified and then I tried the rat killers, and in 20 minutes the rat sounds stopped, and did not return. So the idea works, but you have to modify the system so it is very loud, at least for rats and mice ect... Brother James OSB OFS OSC

You don't subtract the ambient level from the reading to determine the decibel level. As long as the noise source is above the ambient level that is the true decibel reading. If it is below the ambient level, you cannot measure it.

It's kind of like my wife's nagging. I got used to it over time.

The honesty of your testing and comment is so refreshing in a world of hype.

I've worked Pest Control for 25 years. # 1 Find the door and close it.

Damn those late night commercials Rip offs

my bunny hopped out of my room when you tested the first repeller...i guess theres that.....

I worked in an industrial plant. There were no edibles in the plant. That place was so loud you had to wear double hearing protection. The concrete floor hummed from huge electric motors running 24/7. No kill traps were everywhere. We had mice. Not alot. Over 36 years working there I seen mice twice. They were there. Best thing for mice is a hungry cat. Well fed cats wont kill mice.

A rat in my house ate the whole poison cake and was still fine.

They Should Be Class Action Sued.. Damn Thieves..

Awesome. you saved me money and from feeling like a sucker.

Thanks! I save myself ,$35 99,on the purchase,back to the old convention way. The merchant must hate you,but we love you for your honesty thanks again.

I was thinking of trying one. Thanks for taking the time to put this together.

The mice and bugs become desensitized to the sound. It's like when you hear a knocking in your car's engine at first you constantly hear it then after a few days it magical goes away. But it really didn't its just your brain tuning out the noise.

Thank You, Great buyer beware video! Really appreciate your time as well the effort!

I saw a deatmatch between a large rat and a snake today. The snake won, but died from blood loss a few minutes later

Seems like you're misreading the meter, no? The meter detects sound but you will only read sound above ambient. I would think this depends on the meter. I think a simple meter is only measuring maximum sound pressure. Think of it like a water column. You can have one or many different liquids mixing together, but they can only produce one maximum pressure from the most powerful source. The human ear however, perceives many different amplitudes at the same time by different frequencies, not one overall. Human ears (and other ears) hear a spectrum of sounds. Thus you can hear wind chimes against an earth mover. But the wind chimes do not increase the overall sound pressure. Yes?? Meanwhile a normal truck pulling into the driveway won't be heard over a Dozer. This means that the 74db reading is in fact a true 74db from that source - that the sensor can detect. While the no-increase could be putting out up to and equal to the ambient 334db, coming in from all frequencies. You would need a "spread frequency" or sound spectrum analyzer. Go buy one! (I have no idea how to do a valid test on the cheap - it would take a week to figure out unless you can splash the cash on a golden box.)

Nice and informative, and although I believe the units have little effect, the test method used is not really done properly. 1- First of all, the frequency range of the SPL is selected to reflect our hearing range, so the meter might not be within range of the devices, and one should ascertain that it can actually measure in the appropriate range, Sub-sonic or ultrasonic. The unit shown is many for human range. 2- Most SPL meters have a range from 20Hz to 20kHz, and have weightings, i.e. roll-off filters that limit the bandwidth, known as A-B-or C weighted readings. 3- The sound emitted by each device should all be measured at the same distance. At the distance shown, there is a massive difference even at a half-inch, likely around 10-20 dB each time you even marginally move the microphone. Think of how headphones change in sound pressure when you even move them a fraction from your ears. 4- room noise is never deducted from the reading, The device outputs the reading you see. Room noise is irrelevant to the sound pressure level of the device you are measuring, except if the output is below residual room noise. So to be honest, this test really didn't evaluate functionality, other than establish that either the mouse was deaf, or no longer cared and was really hungry. The mouse learned that the sound was just annoying, and not a threat. Sorry but you can't always believe what you see on the internet. The old sound engineer....

I have some experience with the sound level meters and I think they are poor at higher frequencies. That image of the mouse with repellents is hilarious though.

Thank you for video. It is good that you use a sound meter to evaluate DB level of each device. As far as I know, a quite room is appr 20 DBs. Conversation is 45 DBs. Busy traffic noise is 70 DBs. So anything below 70 will be ok for humans. However, since rats can normally hear ultrasound in its lifetime, so an additional amount of ultrasound produced from small device would be neglected. Anyhow I have been using this device for 2 weeks, I observed the different. It works under my carport. By the way, in your tests those with no signal or 5 DB should be broken circuit board.

I installed an ultrasonic pest repellent in the kitchen and discovered the roaches actually congregated around the darn thing like it had candy on it. Weird. Save your money.

If you get a cat, then make sure the cat knows how to hunt mice. Get a kitten raised by mouser barn cats would be optimal.

Thanks for your efforts. I was always convinced that these gadgets were too good to be true and probably total BS. good to see a logical analysis with dB tester.

Several ultrasonic companies were ordered by courts to provide reimbursements/refunds to their customers for false advertisement. I don't trust them, but to each their own. Hope it works for you.

Well, even if the sound was annoying it was still worth enduring it for a free meal.

good video to prove that no electronic devices keep the mice away, I found that the best solution is the glue traps

How about for bugs, like spiders, roaches, ants, fly's and mosquitos? I took these to the Philippines. And using a 500 watt inverter for each. I placed 1 in each room and 2 in the kitchen. I didn't see roaches any longer. They were behind a baseboard in the kitchen. A mouse came to my home in a cargo box I had shipped from the U.S. I used a glue trap and that caught the mouse in one day! Mice in the Philippines look lots skinnier and different than U.S. mice. I held the glue trap up close to examine the mouse before trashing it. The eyes looked black and the surrounding part looked like it was dripping white. No kidding, looked like someone painted the eyes and the eyes were watery or melting. Very odd and gross to a certain extent. But no bugs once I turned the emitters on at night.

dB is a logarithmic scale, so in order to subtract the ambient noise you would first have to convert into sound power, then subtract and then convert it back to dB. But for the dB's you measured the end result should be almost identical to the original measurement (every 6dB the power drops by a factor 1/2, so for a 30dB difference means a factor 1/64 difference which translates to only a 0.1 dB reduction so negligible).

Here’s another suggestion, that I believe works like a charm!! Order (or go buy at walmart, academy sports, dicks outdoors or whatever sporting goods store, or online) some Red Fox Urine (others have used Grey Wolf Urine, and some Coyote Urine, just depends what is available, cheap, and ensure that you select one for a critter that isn’t likely to live in your area so you aren’t “luring” one to your home!!) and it repels critters that are its prey (costs from $10-$20 for several ounces in a bottle or spray bottle, aka plenty for your purposes), as soon as they (mice, rate, raccoons, small to mid sized critters) smell the larger predator urine (and typically it gets dark enough as most are naturally nocturnal that they can hall buns), they evacuate where ever (your home, grarage, horse stable, etc.) in order to get away from whatever predator they smelled that might be around hunting and trying to eat them! We used this solution when a raccoon decided to tear open a section and then hide under our porch outside and to ensure that it didn’t go under and stay under our house. Once applied, as soon as it got dark, that thing (the raccoon) could be heard ripped its way out and then it hauled you know what!, and never came back!! You have to apply the urine to somethiing or directly to your house at the 4 corners (we did all 4 corners and then middle on outside our house along with our porch, so in 6 spots, 9 total so perhaps a bit of overkill??..LoL!!) the urine smells awful, and of course it fades with time and so must be reapplied regularly to continue to work. Also, you have to wait for a dry (non-rainy, non-wet day as water washes the scent away if applied on the outside of your house or if whatever you spray it on gets wet) day.There are various “scent keys” you can hang up that shouldn’t get wet if you hang them up off the ground or obviously where water or rain or water run off can not reach them (or get creative like we did as decribed below). Then reapply, it one week later, so 1x a week for 1 month. Then every 2 weeks, and then once a month, and repeat. We decided to spray some onto tennis balls that we had driven nails into and we tied fishing line around the nail, so we could then easily attach the fishing line at one end to something on the side of the house. That way, we sprayed the tennis balls, tossed them under the house, and later we could easily retrieve the tennis balls by pulling on the string, and reapplying the spray and tossing them back under the house. Obviously, using plastic gloves, and definitely standing up wind!! Also, you can spray the red fox, grey wolf, (large predator) urine onto cotton balls, and place around your yard or inside your garage or roof (it will stink!!), various sporting good stores, or walmart or online, etc. also sell “lure” scent traps for hunters, which are key/pin things that basically are or have cotton or cloth strips in a P or T shape and you can hang them whereever with string, the whole point is that “prey” are repelled by the smell of a large (in its eyes) “predator” moving in, so it immediately moves “out” as it doesn’t wish to be eaten. So, there ya go!... Lastly, this isn’t a soultion for “inside” your home for obvious reasons. For the slow to comprehend, what I mean is that, because spraying animal urine in your house will make it stink to high heaven (even outside or under your house you’ll smell it to a point depending how thick your walls are or floor...aka mobile home verus a brick structure), and also, spraying animal urine inside your house isn’t exactly sanitary!...Trust me, the smell will drive you out before the grossness of it being unsanitary!! This solution is safe for pets, although I’m not sure it they’ll be happy about it, but it definitely won’t harm them physically, because it is only smell/scent! And of course, other than the smell, and as long as you do not touch it, use plastic gloves and wash your hands immediately after applying it, etc.. it is safe for humans too!! Let me know if you have as much success as we have had...(and what with, which type critter)... Hopefully, this works for you too! Good Luck!

I was sick and tired of the traps and decided to get a real cat for my mother and let me tell you he definitely did the job!😀👍🏾. Unfortunately after over 5 years we had to give him up but he's at a good home. Live cats are much much more efficient. Thank you for your video because I was thinking about getting one of these ultrasonic sensors for my place but i think ill just invest in getting a cat 😆👍🏾. God Bless you and your family!.🙂🙏🏾❤🕊

Yeah i guessed , these devices are just good for the revenue generation for the manufacturers

to test simply install a spectrum analizer app to your gadgets, it shows the frequency and the intinsity, sonic output of the device

the nights they didnt show they went to a buffet.

"Manufacturers of ultrasonic pest repellers make claims that may be unsupported by scientific testing. In fact, more than 60 companies received warning letters from the FTC in 2001 stating that “efficacy claims about those products must be supported by scientific evidence." Two years later, one company was sued by the FTC for violating its warning." [INTERNACHI]

This doesn't change the conclusion, but the sound meter almost certainly has limited bandwith, so it wouldn't pick up much (if anything) at those frequencies. I'd guess the one it does give a reading for emitts EM noise. Look at the data sheet for it, it should have a frequency range specified. Outside that it likely drops off steeply.

Maybe that one mouse was deaf

Your device cant check over 12 kHz soynd frequency. On the other hand the ultrasonic repeller frequency is more than 20KHz . So you wrong . You cant check ultrasonic with sound meter tester.

Thanks, Spencer. You Rock for such a crazy thorough comparison! Have you had any luck with devices to repel mosquitos?

After 40 years of trying multiple devices to rid mice, the only ones that actually worked are the ones that you can actually hear. It’s annoying but it works.

Throwing mothballs up in your attic may curb and a little bit,but they get use to that if they have a source of food.

I’ve often wondered whether one could effectively blast this frequency over a high-powered stereo system to irritate rodents into scarcity.

Just to be clear, your math on the dB was not 100% correct. It's not added to the ambient sound... In this case, your room was abut 35 dB (noise floor) and you had a device produce 75 dB. It's not additive i.e. 75-35 = 40, the device produced 75. If your noise floor was 10 dB, you still would have read 75 on the meter.

Your video is the final nail in the coffin of my not buying any of these through Amazon today. Thanks!

After a few nights their ears were dead and they could feast on almond butter.

Been looking for this roach with my brother for like 45mins and we just thought to look up audio of roach repellent and in likw within 2 mins no joke it came out.

@1:58-2:00 Looks like you have 2 spiders as well. 1 immobile to the left & 1 moving to the right. Watch closely for the change on the one to the right. (The one on the left is visible, but doesn't move.)

I have some pretty big sound emitters to keep critters from under my deck. There’s a motion sensor and it screams a high pitched eagle sound that my dogs alerted too for the first few days they set it off. I haven’t had any skunks or raccoons under there in a year, could be coincidence, but anecdotally they seem to work.

Great video BUT would there have been MORE mice if you didn't have the repeller? Also, putting food in front of a hungry mouse might be a temptation it cannot resist even if it needs to endure discomfort. If there was no food lying around and the repellers were on then there may be no mice around..

Well I had a mouse coming into my kitchen. I did a lot of research online , and ultra sonic pest repellents do work. First the brand matters. Also did you read the instructions? Do not use with an extension cord. Must plug into wall. I downloaded a app to my phone and it worked great til I could get a three pack at Walmart.

I enjoyed this video especially the hidden camera with the peanut butter set up is it possible you could do the same test using the fresh cab stuff..... would love a visual if they'll even go near the area even for food

Either the mouse is deaf or the devices simply do not work at all..... why does our government still allow them to be sold in the open market?

I have one and its works for me but the directions said they must be plugged directly into the wall(not into an extension cord).

One thing you should know.....1 noise making 60 db and add another device making 60db does not equal 120 db. It would be 60 db. So your first device was actually putting out the registered amount. The higher number only cancels the lower so if it were dead quiet the readings would still be the same. just sayin

My daughter sent me a Riddex after suffering a very bad spider bite at our house. The decrease in spider webs was very noticeable. Also i found a mouse in the middle of my dining room so disoriented I was able to put a jar over top of him and take him outside,

Get some peppermint essential oil. Mix it with water and spray around the place periodically. Make sure no scraps of food are around and regularly tidy around. The smell of peppermint, lack of food and constant commotion of cleaning makes for a hostile environment for mice and rats

For mice , The best $ 5 solution is " Bounce Dryer Sheets " that are used for laundry , Mice will evade wherever the sheets are present ! Put in the corners of rooms , behind furniture etc .. especially in attic where the temperature is warmer and will activate more scent from the sheets , I haven't seen a mouse since I learned this , same goes for neighbors and friends after passing the info along :)

They might have gotten used to the noise

Dang it, I just purchased the ones u plug in the walls. Next step I'm going to spray everywhere

Guy: "THIS ADDA TO DO IT, NO MICE CAN WITHSTAND THIS LOUND NIT SO LOUD TO HEAR WITH MY OWN 2 EARS BUT FOR SURE GONNA SPEND ALOT OF MY MONEY TO BUY THESE DEVICES!" MOUSE says to another mouse: " HEY JERRY, LOOKA HERE, MAN SO KIND HE BOUGHT US A NIGHT LIGHT WITH SWEET ROMANTIC MUSIC TO HAVE A ROMANI DINNER OF ALMOND OIL JUST FOR U AND ME!!"

Decibels are not additive... If it appears it is not putting out anything it is because the ambient decibel rating is higher than the device is emitting. Also you do not subtract 40 decibels from ambient to get the emitted noise, if the tester reads a 70 decibel source, it is emitting 70 decibels. The tester will read the highest signal source it picks up.

If it's just a matter of Decibel Levels, get yourself a Pantera CD (I recommend "Reinvention of Steel") put it in your Boom Box and play it all night. that should get rid of the mice...or you'll have a mice mosh pit

i recommend Shawn Woods' channel, where you can "digitally" shop for quite an array of mousetraps, both new and antique traps are tested by him every monday. the electronic lunchbox-looking one he did yesterday (~$100) would do you well, i think. or just go down and buy a 10-pack of good ol' snap traps.

But only one mouse showed up as compared to the 100’s of mice you had before. It takes like 4 weeks for the sounds to work.

Can you not sue a company who claims they work. Looks like the easiest provable win ever.

Sorry. Decibel readings are not directly additive. So, for that first reading you did on the big unit, 75 decibels would be its output (minus 0.00034). I knew a guy back in the '70s who claimed that he caused his neighbor to get rid of his never-ending-barking dog (one of those dogs that barks for sport and it doesn't bother the owner) by hooking up an aquarium pump to a dog whistle via a short length of tubing and setting the pump (in a hole) and whistle (at the surface but camouflaged) as close to the property line as he could. .

Thanks! I have been having a mouse problem out in my shed in the back and some of these little 4-leggers are finding their way in the house! I was thinking about getting one of these Electronic Pest Control devices but I really haven't looked into their effectiveness. Well, lucky for me, YOU showed up! Thanks to you I will just keep the traps and snakes going! I live out in the sticks and if you want really good mouse control, catch a few Bull Snakes and turn them loose in your house! I found a mouse hole in the wall in the little room my husband has his tools in. I found a snake, brought him in, and turned him loose in the hole in the wall and Soon the mouse population seemed to shrink! The only problem with using snakes for mice control, my dogs try to kill them when they find them!! They really do work great though!

If the critter has a nervous system it should work. Like bug zappers work on mosquitoes, but not house flies.

My mother-in-law just bought us a 6-pack of these. The box showed no brand name, so I assume it's Chinese garbage. My first thought was "this has to be a scam", and I came right to your video. Thanks for confirming my gut instinct.

This made me laugh 😂 it’s clearly his stomach is taking over his ears 😅😅

" Mouse Piss " sounded funnnnnny

To be honest I don't feel like this is a valid test. The reason being is animals do something called risk assessment. The pro for this mouse in the scenario is food, the con is annoying sound and lights. The pro wins because it's easy food. That's why classic mousetraps almost always work to this day because they can't assess the risk of the spring loaded rod about to break their neck but they can probably smell you since you touched it. I'd say a better way to test these devices is to build 2 wooden frames boxes probably 2 feet by 2 feet and make them about as tall as the flat side of a 2x4 peice of wood and put plexiglass you can see through on top. Then buy or capture 10 mice and put 5 in each box and in one of the boxes put one of these devices in each corner. Then mount a camera above pointing down at the boxes that can film dark rooms and leave it overnight with no food in either box. Next day feed them some cheese or pb then switch the devices to the other box and film it overnight again.

5:35 best is Svinz with 20-40dB emission volume. Low cost ones were very little volume

Saved me 15$ thanks