This ingenious door chime can alert you to the arrival of visitors even if you’re hanging out in your basement or the back part of your home. When someone knocks on the door this device will send a signal to a receiver that will chime in another part of your home. The wireless transmitter allows the chime to be placed anywhere up to 100 feet (30.5m) from the door.
Activated by a knocking vibration
Mount sensor on inside of door with double-sided tape or screws provided