Upgraded 2 in 1 Portable Door Stopper Floor Wedge Security Alarm Loud 120db Entrance Alert Door Stop Alarm for Travel Home Apartment House (3 Packs)

DOOR STOPPER SECURITY ALARM - When the door stopper alarm is in the "on" status, pressure applied to the door triggers an extremely loud 120db alarm. It helps wake or alert homeowners or renters, deter intruders, and possibly notify neighbors. NON-SKID DOOR STOPPER - When the door stopper alarm is in the "off" status, it can be used as a standard damping rubber-base door wedge to hold the door open without producing a loud alarm sound. EASY INSTALLATION - No wiring is required. The alarm is battery-operated and requires 1x9V battery, not included.

Place it under the door. The gap between the bottom of the door and the floor should be 10mm( 0.38 in) to 35mm( 1.35 in). It will not slide on tile when the door opens. On smooth floors, try using the H-type sensitivity vibration-sensing alarm. 3 SENSITIVITY LEVELS - Low, Medium, and High, with an adjustable sensitivity switch on the side. The H level is the most sensitive level, and vibration will trigger an alarm. When the alarm sound gradually becomes smaller, replace the battery. PORTABLE DOOR STOPPER ALARM - The package contains 3 door alarms, each weighing about 120g.

They are easy to carry, with a 120db alarm to help protect you. Great for travel and ideal for bedrooms, hotels, apartments, dorm rooms, front doors, and more