Made of sturdy plastic material, the design is and compact,Use 1x AAA batteries that are more easily available, and the battery can be easily replaced. (Batteries are not included in the shipment) The continuous alarm duration can reach 360 minutes. And support IP44 waterproof, light control, once: always on, again: flashing, can be used as a flashlight for lighting, and can also send out a distress signal at night. Activating the personal alarm emit a 130db sound accompanied by a flash, which can effectively scare away thieves. The alarm is portable and cute, and can be hung on a backpack. It can also be used in the following scenarios: elderly people living alone seeking help, lost in the wild, and children in distress seeking help. Continuous alarm duration: 70 minutes Lighting use time: 20 hours Working voltage: 1.5 Standby current: 0.03u Alarm current: Less than 100mA Product appearance size: 87.5x30x13 (mm) Colour:Black Material:Plastic Package Contents: 1x New Girls' Wolf Door Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.