10x Home Door Handle Hanging Battery Operated Burglar Security Alarm Sensor Highlights 10x Home Door Handle Hanging Battery Operated Burglar Security Alarm Sensor Description: Just hang the alarm in the door handle/knob, when someone opens the door or touches the door handle on either side, the alarm will generate a loud alarm sound to inform that there is an intruder. Works as a burglar alarm, alarm siren up to 120 dB. Easy to use and install, no wiring required (requires DC 6F22 9V batteries, not included); simply hang the alarm on the inside of your door handle. Perfect and ideal travel alarm for home, hotel, dorm, etc. Sensitivity may be affected by the composition of the door handle. Specification: Material: Plastic Size: Approx. 10x5.5x2.5cm / 3.94x2.17x0.98 inch Power: DC 6F22 9V Package includes: 10pcs Door Handle Alarms Note: Since the above size is measured by hand, the size of the actual item may be slightly different from above size. Due to lighting effects, monitor settings etc.