Door Beacon (Door Knock Signaler)

Vibration activated flashing light: alerts you to
someone knocking at the door
Hanging bracket and Velcro mount: attach to any door, at home or away, use in the workplace, hotel room, dorm, etc.
Great for privacy: bathroom, bedroom and etc.
Sensitivity switch: for different style doors
Battery operated: 9-volt battery (not included)
One year warranty