The Chamberlain/Liftmaster myQ myQ-GO302 Smart Garage Hub Add-On Door Sensor is a smart home device designed to enhance the functionality of your garage door. With compatibility for various brands like Garage Doors Inc., LiftMaster, Chamberlain, and Amarr, this sensor can be easily integrated into your existing garage door system. Operating on battery power with a lead-acid battery technology, this sensor has an operating range of 100 ft and features illuminated buttons for easy operation. It is also compatible with Amazon Alexa and Samsung SmartThings for added convenience and control. Made of plastic and metal, this sensor includes a cover and is designed to provide a secure and reliable addition to your garage door setup.