The date and hour will be same as your local internet time after you pair it with app. If any further question, pls contact the guy whom you bought this from. Or contact me by email: sales01@szwlx.com

I can not add it anymore. It lost connection due to low battery. After battery replacement it did not reconnect automatically as usually after battery swap. Deleting from app and adding as new device does not help. What can I do home router reseted other 4 sensor working fine. What interface lines do you have printed on the PCB under middle battery?

@@qqqqqq6686 I got the same problem with mine... I guess they are just junk... I moved to a new apartment and the only thing that just didn't work was this device...

It is junk, as I am passionate about electronic s I will keep mine for a recovery try. There are good and bad versions of this crap. The good ones (as for today) are with tx rx lines under the battery. And these you can reflash via serial interface and move to some open project firmware with your control server. The one bad of mine is "latest" Chinese discovery with arm cortex 0 cpu. And this bad version has no tx rx lines printed under the batteries it has arm debug interface marked I/0, CLK beside that both have vcc and gnd printed(supply lines). I tried to read it with segger clone unsuccessfully. It has probably some data crash in wifi module, I see it send rf packets but in different way than a good one. I brought a new one but I hope some day I will make it running again. What interface lines do you have printed under the middle battery, @Jakob Varming

@@qqqqqq6686 It got the following printed: CLK-IO-GND-VCC. So it is most likely from the same batch as yours.