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This alarm is a burglar alarm and a personal alarm.
The Dual Purpose 120db Alarm can be hung on any door knob (non-metallic) and it will instantly and automatically sound when an intruder touches the door knob. It may also be carried as a personal alarm that is activated when you simply pull out the metal chain to sound the alarm which will deter any assailant set on causing you harm. The unit requires one 9V battery.