USB RECHARGEABLE: No more battery replacements needed. This alarm keychain is equipped with a USB charging cable for convenient recharging. Charging takes only 30 minutes, with a standby time of up to a year. The charging indicator glows red while charging and turns off when complete. 2 ALARM MODES: Dual alarm modes: quickly pull out the pin or press the switch twice to trigger the alarm. The sound reaches 130 decibels and can last for 50 minutes of continuous alarm. 2 LIGHT MODES FLASHLIGHT: The personal safety alarm features a built-in mini LED flashlight with two modes. The constant light mode illuminates your path in dark corridors or at night. The flashing mode can temporarily blind an attacker's eyes, helping you find your location faster. IP44 WATERPROOF & WIDE APPLICATION: The alarm keychain is made of strong ABS material, drop-proof, and IP44 waterproof (rain-resistant, do not submerge in water). Provides comprehensive emergency self-protection for women, children, the elderly, girls, students, and night workers. EASY TO CARRY: The personal alarm is designed with a snap-on feature for easy storage and portability. It can be attached to women's leather bags, backpacks, school bags, belt loops, suitcases, keys, dog leashes, etc. The alarm can be easily attached to your bag, keychain, or wallet for quick access.