Product Size: 73X41X21mm. Ultra-Loud Siren: This -130dB mini siren keeps you safe in case of danger or if you need help. The loud siren is powerful and can attract attention from a distance. If you're running alone at night and encounter someone following you, activate the alarm to call for help. The alarm is very loud, so please don't put it near your ear. Waterproof & Rechargeable USB Design: The personal alarm has a built-in rechargeable battery. The red light stays on while charging and turns off when complete. Charging takes only 30 minutes and provides long-lasting power. The personal alarm is IP44 waterproof, so it can withstand wind and rain, protecting you 24/7. Emergency LED Flashlight: The built-in LED flashlight provides quick illumination when walking in the dark. It can also sound an alarm to prevent getting lost while traveling, or use the flashing LED function to attract attention and seek help in time, protecting your safety. Lightweight & Portable: The double buckle design can be attached to backpacks, school bags, purses, belt loops, suitcases, or keychains, providing perfect self-defense for students, women, night runners, and night workers. To sound the siren, simply press the SOS button twice quickly or pull the siren. Best Gift Choice: Comes with 2 different colored alarms, each individually packaged. This personal alarm makes the most thoughtful gift for older children, friends, and family.