AL-2 Dual-purpose 120db Alarm

The AL-2 Dual-purpose 120db Alarm acts as a burglar alarm and a personal alarm. Hang it on any door knob (non-metallic doors) and it instantly and automatically sounds when an intruder touches the door knob. Carry it with you and just pull out the metal chain to sound the alarm and deter an assailant. Uses one 9-volt battery.