Window Alarm 4 Packs - Loud 120dB and Vibration Sensors Compatible With Virtually Any Window - Glass Break Security Sensor - Low Battery LED Indicator

They do work especially if I open the patio door and forget to turn it off! The flashing light is hopefully a deterrent and the sticker on the back that goes against st the wi down another warning. Highly recommended

One of the teeth is broken

Works great

These window alarms are excellent. We have an older home with a few basement windows. I installed one alarm on every window. Pros: good size, warning sticker and light alert that the windows are alarmed (and the light means you know if the batteries have power), can be placed anywhere, on-off switch, easy battery access, extreeeeeeemely loud (my cat set one off - it could be heard outside, throughout the house, and was so loud that I could barely think even with ears covered to go switch it off and back on), sensitive. Cons: unknown as to whether they can be removed and reused due to the sticker attachment. It would be nice if 3 were included per alarm. Highly recommend as an extremely easy, affordable, and quick security update. Anyone can install them.

Honestamente, tienen un mejor precio, ya que ahora cuestan 500 ish, los compré por 1000 pesos y todavía era un precio decente ahora por 500 pesos, este producto es algo que definitivamente compraré mucho más, vale mucho.

Alarms arrived quickly and worked well. It was easy to install, although I switched the sticky pad to hide the alarm information (white/blank side to the window). I accidentally set it off when installing and it was sufficiently loud on LOW to hear across the house.