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- Heavy gauge steel tension bar wedges between the underside of the doorknob and the floor
- Prevents the door from opening from the other side, and when the doorknob is touched an alarm sounds
- You can even choose between a powerful siren sound or barking dogs
- Bar extends from 29" to 43" to fit any door
- Requires one 9-volt battery (not included)
SKU # 16098515