New Unopened Open Detection Security Door Alarm Set of 6 Loud alarm when doors and windows open! Convenient for crime prevention and customer detection in stores and offices. Also ideal for monitoring children with interior doors, etc. Material Body: PS Internal: Magnet / Switch: POM Size: Approx. W3.4 x D2.2 x H9.2cm Weight: Approx. 36g *excluding batteries ● Simply attach to windows and doors to alert you to intruders with a loud 120dB buzzer. ● Can be used in various places such as entrance doors, window glass, and drawer doors. ● Battery operated: Operates on 2 AA batteries, so no power cord is needed. ● Crime prevention: Works great as an alarm to prevent burglaries and intruders.