Mini Wireless Vibration Triggered Home Wedge Shaped Stopper Alert Security System Door Stop Alarm Block Blocking System $5 at Walmart

Wireless.
Adjustable High-Medium-Low sensitivity.
Vibration sensor.
No installation required, easy for travelers to carry.
Wedge-shape design to fit any hinged door.
120 dB high-pitched continuous siren when activated.
Can be used as a doorstop when power switch is turned off.
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