【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 directly, and the charging time is only 30 minutes, then you can be on standby for a year. 【130dB Security Alarm】With ear-piercing sound to attract others' attention even 300 meters away when you are in danger. Up to 90 minutes of continuous sound to ensure emergencies. 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 switch twice quickly to activate the alarm. LED Emergency Flashlight: Bulbs are larger and brighter than flashlights of traditional security alarms. 【Lightweight & Portable Alarm Keychain】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