[Powered by 9V Battery]: Powered by 9V battery, One piece can be used for a year under normal circumstances. (Note: Battery not include)
[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.
High sensitivity, medium sensitivity, low sensitivity levels are determined by the proximity at which the door triggers the alarm.
[Loud Alarm]: Very loud shrill that would definitely scare someone away with 120db alarm. Weight: 4.5 oz.
[Easy to Use]: NO installation required, Simply place the alarm behind any door (home, hotel, etc).