ThreeH Door Stopper Alarm 2 Pack 120dB Loud Portable Wedge Entrance Alert Safety Tools for Home Security House Apartment Hotel Travel

【Dual Function】: Can be used as a door stop alarm and door stopper, if someone attempts to open the door, this product will prevent it from opening and activate a 120 dB alarm. Also you can use it as common door stoppers when turn off the ON/OFF switch, its high damping rubber bearing can prevent the door sliding and prevent the bad guys into.
【120dB Security Alarm】: Alarm will be triggered when someone open door, 120dB high-pitched continuous siren will be a great deterrence for any thieves or intruders.
【Easy Installation】: 1) Put one 9V battery; 2) Select sensitivity level: M(middle), L(Low), H(High); 3) Turn ON alarm; 4) Insert alarm under door. The gap bewteen the bottom of the door and the floor should be 10mm(0.38 in) to 35mm(1.35 in)
【3 Levels Sensitivities】: With an adjustable sensitivity switch on the side, 3 levels sensitivities are optional, M(middle), L(Low), H(High).
【Wide Applications】: Easy to carry, size 5.3 * 1.8 * 1.4inch(13.5 * 4.5 * 3.5cm) Net weight 4.2oz(120g). Great for travel; ideal for bedrooms, hotels, apartments, dorm rooms, front doors, etc; peace of mind when traveling or working alone.