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. A protector around you. Can be used in home and travel.Notice: The door stop alarms fit for the gap between the door and the ground be 0.6'' and 1.2''. 3 Level of Sensitivities: High-Medium-Low Sensitivities, which can be adjusted accroding to your own needs. Loud Alarm: Very loud shrill that would definitely scare someone away with 120db alarm. Weight: 4.5 oz. Powered by 9V Battery: The door stop alarm powered by 9V battery, One piece can be used for a year under normal circumstances. Very practical. (Note: Battery not include) Easy to Use: No installation required, Simply place the alarm behind any inner pull door (home, hotel, etc). very convenient to take with you when travel or stay indoor alone. A really must have around you.

This Door Wedge can be easily applied to closed doors, when the door is opened it will activate an alarm alerting you of a possible security breach.
Door stop alarm & door stopper keep intruders out, also prevent the doorknob from hitting the wall.
High- quality: Made of high damping rubber & abs plastic, very convenient to use.
Loud alarm: 120dB loud alarm sound could scare intruder.
Portable alert 3 sensitivity levels: Low - Medium - High, with an adjustable sensitivity switch on the side.
Easy to Install: Portable and easy way to add piece of mind when traveling or working alone.
Widely use: Can be used in home, dorm, office hotel, motel & more.
Specification:
Power by: 9 v battery (not included)
Single size: 5.5 * 1.8 * 1.5 inch
Single weight: 0.2 lb
Package includes:
4 x Door stop alarms (9v battery is not included.)