Review on Wsdcam Door And Window Alarm For Home Wireless Alarm Security System Magnetic Alarm Sensor Close Door Reminder Loud 110 DB, 4-In-1 Mode Window Alarms 10 Pack by Aaron Fowler

These work just as advertised. The alarm is quite loud, but then you do need to hear it. Just be aware that the distance between the alarm and magnet should be less than 1 cm. I couldn't get my alarm to shut off at 1st, but realized I had the two pieces too far apart. I was able to take them off and reseat them without damaging the unit or the paint. The sticky back did adhere to the glass on my window, but I was able to peel it off easily. I replaced it with double sided tape and everything works fine. I bought the set of 10 but only used two as I am in a small condo and only needed them for the main entry and a window in the kids' room. If I need a replacement, I have plenty on hand and the price was super affordable.