Security Door Stopper Alarm

Description

EASY INSTALLATION – no wiring needed; battery-operated (requires 1x9V battery ,not included),push the turn on button in the back of the door stop alarm into working status; 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 can not slide on tile or smooth hardwood door when door opens, smooth floor can try to use H-type sensitivity ,vibration-sensing alarm.