The Chamberlain MYQ-G0402 Garage Door Sensor in White is a receiver-type device powered by a lead-acid battery, operating at a frequency of 40 MHz. It has a smart home protocol of Bluetooth and is compatible with Apple HomeKit. With an operating range of 100 ft, this sensor is designed for use with LiftMaster, Chamberlain, and Amarr garage door brands, particularly the 2500 model. The sleek white design adds a modern touch to any home's hardware and equipment.