Ultra-powerful siren The -130dB mini-siren protects you in case of danger or in need of help. The loud siren has a powerful impact and can also attract attention from a distance. If you run alone at night and meet bad people following you. you can activate the alarm and call for help. the alarm sound is very loud. please don't put it in your ear. USB Waterproof and Rechargeable Design - The personal alarm has a built-in battery that can be cyclically charged. The red light is always on when charging and off when charging is complete. The charging time is only 30 minutes and it is long lasting. The waterproofing of the personal alarm is IP44. which is not afraid of wind or rain and can protect you for 24 hours. Emergency LED flashlight: The built-in LED flashlight provides quick illumination when walking in the dark and can sound an alarm to prevent you from getting lost while traveling. or use the LED flashlight feature. who flashes frequently to attract others' attention. draw yourself. to seek help in time and to protect the safety of your life. Lightweight and Portable: Double buckle design can be attached to backpacks. to school bags. to wallets. belt loops. suitcases or key chains. and offers perfect self-protection features for students. the women. night runners and night staff. If you need to sound the siren. simply press the SOS button twice quickly or pull the tab on the siren. Best Gift Selection: The alarm is individually wrapped. The personal alarm is the most intimate gift for older children. friends and family.