Featrues 1. USB Rechargeable Battery: Personal alarm siren is made of rechargeable lithium battery, not button battery. Don't need to replace the battery, directly use the usb data cable to charge and charge time is only 30 minutes. 2. 130 dB Safety Emergency Alarm: With ear-piercing sound to draw others attentions even 300 yards away when your'e in danger. Up to 50 mins of continuous sound to ensure emergency use. It will replace selfdefense weapons to protect your safety. 3. LED Emergency Flashlight: Light bulbs are bigger and brighter than flashlights of traditional security alarm. The flash can last about 5.5 hours. 4. Lightweight & Portable Alarm Keychain: Personal alarm can be attached to purse, backpack, keys, belt loops, and suitcases. It also can be brought onboard a plane, really convenient. 5. Suitable for Everyone: Get the help you need quickly. Commonly used by seniors to call for help in case of falling, feeling unsafe, physically threatened, medical emergencies, accidents, or allergic reactions. Great gift for parents, college students and everyone that works evenings. Wonderful siren keychain for everyone. Specification Material: ABS Color: Pink, Blue, White, Black, Purple, Green Size: 734121 mm Weight: 35g Charging Voltage: 5V Charging Current: 1A Battery Capacity: 150mAh Charging Time: About 30min Lighting Duration: About 75min Alarm Duration: About 50min Flashing Duration: About 5.5h Package Include: 1 Personal Alarm 1 USB Cable