[Easy to Use]: NO installation required, Simply place the alarm behind any door (home, hotel, etc).
[Dual Function]: Can be used as a door stop alarm and door stopper, Its high damping rubber bearing can prevent the door sliding and prevent the bad guys into.
[Powered by 9V Battery]: Powered by 9V battery, One piece can be used for a year under normal circumstances. (Note: Battery not include)
[3 Sensitivity Levels]: High, Medium, and Low Sensitivities. These levels are determined by the proximity of the door to the door stop alarm.
[Loud Alarm]: Very loud shrill that would definitely scare someone away with 120db alarm. Weight: 4.5 oz.