Thank you so much. I was confused because during testing it read GAS then 222. I did it again and it read 221. I thought I was testing wrong.

Would you be able to make another video showing us what every code means

Thank you. I so appreciate your video.

Got mine from Amazon and there was no owner's manual. I came here just to learn how to install the battery.

is there a way to disable the battery backup fail alarm/beep? What if I connect the 9V input from the cord to the battery connectors?

I have one for my living room

Im struggling trying to get the back off lol im so confused

I get a blinking dot instead of 0.

I have this. Does it come with an app?

For those consumers who are interested in the credentials behind this product's performance, understand the following before considering a $20 device. This Kidde Nighthawk meets the requirements of: 🢝 UL 2034 🢝 UL217 🢝 NFPA72 🢝 The State of California Fire Marshal 🢝 NFPA101 (One and two family dwellings) 🢝 Federal Housing Authority (FHA) and 🢝 Housing and Urban Development (HUD) Choose wisely...