This is a dual function emergency attack alarm. It features a 120 dB alarm, which is the loudest personal alarm. Can be used as a single woman at night anti-wolf alarm. Children school personal safety alarm on the road.The elderly emergency rescue and other purposes ! Help you get out of the emergency situation. Portable size, can be a pendant on your bag. Use: remove the insulation film on the back, then you can pull out the key ring on the top, at last the personal alarm can make high decibel 120DB sound! Plug the keychain to disable the alarm !