USB Rechargeable Battery: The personal alarm siren is made from a rechargeable lithium battery, not a coin cell battery. No need to replace the battery, just use the USB data cable to charge, the charging time only takes 30 minutes, and you can stand by for a year.130dB Security Emergency AlertHave ear piercing sound, which can attract the attention of others even 300 yards away when you are in danger. Up to 50 minutes of continuous sound for emergency use. It will replace self-defense weapons and keep you safe because pepper spray2 ways to use: You can quickly pull the contact pin out or press the switch 2 times to activate the alarm.LED Emergency Flashlight: Bulbs are bigger and brighter than traditional security sirensLightweight and Portable Alarm Clock KeychainSelf-defense alarm clock can be mounted on wallets, backpacks, keys, belt loops, suitcases. It can also be taken on the plane, very convenient, suitable for students, joggers, elderly, children, women, night workers.