home self defense alarm 130db egg shape girl women security protect alert personal safety scream loud keychain emergency alarms

security alarm system ,women's self defense children calling for help the elderly call for help outdoor distress call for help product size: 73*42*21mm packing method: color box packing color box size: 7*5.2*2.6cm carton: 50*38*26.5cm packing 500/carton gross weight: 16kg power supply mode: battery powered battery: three built-in lr44 button batteries weight: 30g time: standby for 8-12 months, long ringing for 1.5 hours, led light always on for 24 hours applicable people: elderly, children, students, ladies