[Dual Function:] It can be used as a door stop alarm and door stop, if someone tries to open the door, this product will prevent opening and trigger a 120dB alarm. Also you can use it as a common door stop when you turn off the ON/OFF switch, its high cushioning rubber pad can prevent door sliding and prevent bad guys in.
120dB Security Alarm: The alarm will trigger when someone opens the door, 120dB continuous high tone siren will be a great deterrent to any thieves or intruders.
Easy installation: 1) Insert a 9V battery; 2) Select the sensitivity level: M (meddle), L(Low), H(High); 3) Turn on the alarm; 4) Insert the alarm under the door. The gap between the bottom of the door and the floor should be from 10mm (0.38") to 35mm (1.35").
3 levels of sensitivity: With an adjustable sensitivity switch on the side, 3 levels of sensitivity are optional, M (meddle), L (Low), H(High).
Wide applications: easy to carry, size 5.3 * 1.8 * 1.4 inches (13.5 * 4.5 * 3.5 cm) Net weight 4.2 ounces (120 g).Great for travel, ideal for bedrooms, hotels, apartments, dormitories, front doors, etc; Peace of mind when traveling or working alone.