New Design Vibration Door Stop Alarm with 120dB Siren Door Stop for Home & Travel

Specification:

FUNCTION: 
Can be used as a door stop alarm and door stopper, It's with silicone material can gripping on any surface to prevent the door sliding and prevent the bad guys into. A protector around you. Can be used in home and travel, The door stop alarms fit for the gap between the door and the ground be 5mm-15mm.
OPERATION:
1.Easy to Use: No installation required, Simply place the alarm behind any inner door (home, hotel, etc). very convenient to take with you when travel or stay indoor alone.
2.the door stopper alarm in "on" status,5 seconds later, will enter the working sensor state. when door pressure is applied or vibration, the door alarm will be triggered while make extremely loud 130db alarm, helps wake or alert homeowner. The alarm sounds will stop after 30 seconds.
BATTERY INSTALLATION:
When the alarm sound goes low ,please replace the batteries,Remove screws from the back cover and replace LR44*3PCS button batteries observing+/- polarity.