General description Extra loud alarm designed for security at home or while traveling. Simply place the alarm behind any door. Should an intruder attempt to open the door, the wedge-shaped design prevents it from opening and triggers a 120 dB alarm, deterring the intruder and alerting you to the break-in attempt. Technical specifications Size: 14 x 4.5 x 3.8 cm Net weight: 96 g Gross weight: 128 g Alarm volume: 120 dB Power supply: one 9V battery Other information The gap between the bottom of the door and the floor should be 1 to 3.5 cm.