【USB Rechargeable Battery】Personal alarm siren is made of rechargeable lithium battery. You don't need to replace the battery, just use the USB data cable to charge it directly, and the charging time is only 30 minutes, then you can have standby for one year. 【130dB Security Emergency Alarm】With ear-splitting sound to attract others' attention even 300 meters away when you are in danger. Up to 90 minutes of continuous sound to ensure emergency use. It replaces self-defense devices to protect your safety, such as pepper spray. 【2 Ways to Use】You can pull out the contact pin or press the power switch twice quickly to activate the alarm. LED Emergency Flashlight: Bulbs are larger and brighter than flashlights in traditional security alarms. 【Lightweight & Portable Alarm Keyring】Self-defense alarm can be attached to handbag, backpack, keys, belt loops and suitcases. It can also be taken on an airplane, really convenient, suitable for students, joggers, elderly, children, women and night workers. Show more