Super loud key pendant alarm, mobile phone back wallet pendant, anti-loss device, alarm that sounds immediately upon pull, wholesale anti-wolf device, silent warning for girls to hooligans! Avoid embarrassment usage method: Remove the insulating sheet at the back and you can hang it on your bag, mobile phone or other items. In case of emergency, you can pull out the keychain at the top. The personal alarm can emit a sound of up to 120DB! Plug in the keychain and the alarm goes off!