125DB Loud Window Alarm: When NOOPEL glass break alarms detect vibration or shock waves associated with glass shattering, they sound an 125db alarm continuously 30 seconds..Adjustable Sensitivity Settings: With roller vibration sensitivity adjustment design, you can set sensitivity level easily to prevent false alarms.Ultra Slim and Low Battery Indicator: Includes FIVE glass break alarms, each dimension Size: 2.9" x 2.9" x 0.4”, each with 2 adjustable settings ON/OFF, each with 3 X LR44 Batteries included. Built-in low battery indicator to check battery life easily..Easy Installation: By simple peel and stick as includes double sided tape! No wiring needed! No screws needed!.For Your Safety: Ideal window alarm for your safety to deter intruder thief entry and alert residence. Also perfect glassbreak warning for your house, office, apartment, garage, dorm, RV, hotel and so on.