Door Stopper High Pitched Alarm
The Alarm will be sounded when the door closes to the stopper
For Secured Entrance to any prohibited area
For safety and peace of mind at home or traveling
Alarm can be switched OFF as a Door stopper
Adjustable sensitivity
Battery: 9V x 1 piece (not include battery)
Dimensions: 4.2 x 13.8 x 3.5 cm

Detailed information:

The on/off switch will prevent the unit from accidentally sounding. Requires one 9 volt battery. Its so inexpensive and simple, yet this door stop alarm can save you from being robbed, or worse.
For example, if you are traveling and want to secure your motel room, place the door stop alarm about one foot behind the door. This will allow you to open the door enough to reach down and remove it so it won`t go off when you enter. Yet, someone who does not know its there will open the door to enter and set it off.
Can also be used as a door wedge to keep doors propped open.
Can also be used to keep people IN!
Know when someone leaves their room as well.