4 Packs Upgraded Door Stop Alarm Portable Wedge Door Stoppers Security Alarm 120db Entrance Alert Loud Door Stop Alarm for Travel Home Apartment or Dorm Battery Included (4 Packs)

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  • Easy Installation No wiring needed, just put 1x9V battery ( included) , place it under the door, the gap bewteen the bottom of the door and the floor should be 10mm(0.38 in) to 35mm(1.35 in)and switch the button on the back to ON then it can works.
  • Non-Skid Door Stopper When door stopper alarm is in the "off" state, it acts as common door wedge, its high damping rubber prevents the door from sliding and keeps the door in the open position.
  • 3 Sensitivity Levels Low - Medium - High, with an adjustable sensitivity switch on the side; H level is the most sensitive level that vibration will trigger an alarm; please note when the alarm sound gradually becomes smaller, it means to replace the new battery.
  • Portable Door Stopper Alarm The package includes 4 door alarms, each weight about 120g; easy to carry; alarm loud 120db to protect you; great for travel, apartment, home, etc; to protect you when traveling or working alone. A protector who really must be around you.

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