Inexpensive Wireless Security Systems, Wireless Security Door Stop with Alarm, Single Room Privacy. Secures Your Room From Unwanted Intruders with Wedged Force and Loud Alarm. Used in Dorms, Hotels, Office, Apartments, Homes, Doors and Windows. Secure Your Window with the Motion Senser, If It Is Moved It Alarms. Watch who you buy from, the other suppliers ship from China. We ship from Amazon USA. Inexpensive Wireless Super Safety Wedge & Warning Alarm for Office, Travel, Home, House, Dorm Room, Apartment, Hotel With Siren System Door Alert 3 Motion Sensitivity Levels-Low-Medium-High and Runs on one standard 9 volt battery easy to install. Extra Loud Alarm is a 120 dB siren when protected door is opened. Acts as a door wedge to stop an intruder from entering Wedge shaped door stop design prevents further entry the harder they push. Inexpensive and portable solution for hotel doors, offices, dormitory room entrances or your home. Bottom of door alarm has anti-slide pads to hold it secure. Three position motion sensitivity control activates the alarm if the unit is moved.