Mini Wireless Vibrator Triggered Wedge Shaped Door Stopper Alert Home Security System Door Alarm Blocking Block Black (Pack of 1) MS-M68

3 sensitivity levels - low - medium - high, with an adjustable sensitivity switch on the side.

Also functions as a wedge to prevent the door from opening when powered off.

No installation required. Requires a 9-volt battery.

Portable and easy to add a little peace of mind when traveling or working alone.

Extra loud alarm. A 120-decibel alarm sounds when pressure is applied to stop the door.