Just put the Door Stop Alarm under the door and turn on the switch. Its sloped design and anti-slip base provide ultimate gripping power and allow your door stoppers to work on every floor surface.
Dual Function: It 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. A protector around you.
3 Level of Sensitivities: Hige-Midium- Low Sensitivities that depends on the distance door touch the door stop alarm.
Loud Alarm: Very loud shrill that would definitely scare someone away with 120db alarm.
Powered by 9V Battery: The door stop alarm powered by 9V battery, One piece can be used for a year under normal circumstances.(Note: Battery not include)
Easy to Use: NO installation required, Simply place the alarm behind any door. It's very convenient to take with you when travel or stay indoor alone.