Schneider Electric Harmony™ Square D™ Wireless and Batteryless Transmitter, For Use With: Harmony™ XB5R 22 mm Round Control and Signaling Unit, Specifications: 2405 MHz, 0.87 in Dia Mounting, Spring Return Operating, -25 to 55 deg C Operating Temperature, IP65/IP30 Enclosure, Plastic, 30 mm W x 43 mm D x 41.5 mm H Dimensions