1 UU% brand new and high quality Suitable as women self defense alarm device or children anti-lost alarm, ect.Easy to operate, just unplug the bolt, then the electronic alarm will send 90dB loudly alarm sound, plug the bolt and the alarm stops, 2.can be used circularly, suitable for women, children, the elderly. Can be made into a mobile phone anti-theft alarm, hang the bolt on the mobile phone. Protect yourself or a loved one. The sound will startle intruders away for your safety.