ZZRUI 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 – the door stopper alarm in “on” status,when door pressure is applied,the door alarm will be triggered at the same time as make extremely loud 120db alarm,helps wake/alert homeowner or renter, helps deter intruder and most likely notifies neighbors,security protection.
NON-SKID DOOR STOPPER – the door stopper alarm in “off” status,it may be used as common damping rubber base door wedge,hold door in open position,no any loud alarm sound.
EASY INSTALLATION – no wiring needed; battery-operated (requires 1x9V battery,not included);place it under the door,the gap bewteen the bottom of the door and the floor must be 10mm(0.38 in) to 35mm(1.35 in),it can not slide on tile when door opens,smooth floor can try to use H-type sensitivity,vibration-sensing alarm.
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 progressively becomes smaller,it means to replace the new battery.
PORTABLE DOOR STOPPER ALARM – package include 3 door alarms,every weight about 120g;easy to carry;alarm loud 120db to offer protection to you;great for go back and forth;ideal for bedrooms, hotels, apartments, dorm rooms, front doors, and so on;peace of mind when traveling or working by myself.