Loudly: The 130db alarm will keep you safe and sound an alarm in unsafe conditions, and can be heard from 400 meters away, can helps to shock and deter an attacker and draw attention in times of need, used as protection. Waterproof: The personal alarm has an IP44 rating, which means it can prevent water splashing Rechargeable battery: Just use the included USB cable to charge the 110mAh battery in 30 minutes. Multi-purpose: The alarm has a built-in flashlight, which can provide extra safety protection in the dark. Suitable for people at all ages such as students, elderly, children, women, night workers and so on; You can also use them for traveling, hiking, camping at night. Specification: Material: Eco-friendly ABS Charging Time: 30 minutes Alarm Duration: 50 minutes Decibel: 130 decibels Flashing Light: 75 minutes Lighting: 5.5 hours Battery Capacity: 130mah Charging Voltage: DC5V Charging Current: 1A Size Chart: Size: 134x41mm / 5.28x1.61inch Package Includes: 1 Piece Personal Alarm 1 Piece USB Cable Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.