The Smartest DIY Home Improvements

No Doorbell? No Problem! The Wireless Knock-Knock Door Chime automatically alerts you with a chime when someone is knocking at your door. The wireless sensor mounts easily on the inside of your door with double-sided tape. The wireless transmitter can be placed anywhere in your house or office up to 100 feet from the door. The smart sensor is activated by the vibration caused from knocking. One year warranty.