Portable anti-theft alarm, ideal for home, apartment, hotel and travel. (4 unit)

Compact and lightweight: Measuring just 14cm x 4.5cm x 3.8cm and weighing just 0.08/0.1kg, its wedge shape allows it to easily fit under any hinged door. Loud security alarm: The alarm goes off instantly when the door is opened; its continuous sound volume of 120 dB effectively deters thieves and intruders.Easy to use: 1) Insert a 9V battery; 2) Select the sensitivity level: M (Medium), L (Low), H (High); 3) Activate the alarm; 4) Slide the alarm under the door.Three sensitivity levels: The side switch allows you to adjust the sensitivity to three levels: M (Medium), L (Low) and H (High). Ideal for bedrooms, apartments, hotels, student residences and entrances, for guaranteed peace of mind.