Hearth Products Controls Acumen Ultrasonic Thermostatic Fireplace Remote Control (TRX-25) Wireless remote control for use with a gas fireplace User friendly timer/thermostat transmitter provides a simple and convenient wireless control Ultrasonic signal works great in areas with heavy radio frequency interference Receiver box operates on (4) AA batteries and remote operates on (2) AAA batteries Includes battery powered receiver, snap-on wall plate, wires with connectors, and transmitter