Review on SITERWELL 10-Year Smoke Detector with Photoelectric Technology, Built-in 3V Battery, Low Battery Warning and Silence Function, UL217 and GS508 Certified – Pack of 4 by Toby Galbraith

*** 1 year update *** The sticker/magnet on my second one failed after about 9 months. Can you guess what happened? It also fell about 10 feet, broke, and I had to open it up to stop it chirping. So, about a year ago I bought 3 and left 1. I attached the last one to the wall with screws because the magnet/sticker is obviously broken. The magnet failed causing the alarm to fall about ten feet which caused the alarm to go off and I had to open it and cut the wires to stop it beeping. I liked the magnet feature because it was easy to install, but one of the engineers needs to work on the magnet's durability!