Door Knock Signaler

Flashes light with knock on the door. As BONUS it can be turned on and used as a flashlight when needed.

Features:

• Senses door knock vibration 
• Flash of extra bright light responds for several seconds
• Sensitivity switch ensures maximum results 
• Lifetime LED light never needs replacing
• Use at home or away 
• Simple to install. 
• Uses 9 volt battery (not included) 
• Permanently install with a screw, attach to door with velcro or use hanging bracket included.