Schneider Electric Square D™ Harmony™ Wireless and Batteryless Transmitter, Batteryless Round, Series: ZB5R, 0.87 in, Momentary Contact Mode, Spring Return Operator, LED Lamp, 3 mW Lamp, Bezel/Housing: Plastic, Flush, Screw Terminal, IP30/IP65/IK03, Panel Mount, -25 to 55 deg C, Black, Environmental Conditions: -40 to 70 deg C Storage Temperature, 95% Relative Humidity