Hazmat Information: UN 3091 Lithium metal batteries packed in/with equipment; Application: Heating and Cooling systems,RedLINK Thermostat Accessory; Dimensions (in.): 6 1/4 in. high x 3 1/8 in. wide x 1 5/8 in. deep; Used With: RedLINKTM enabled thermostats and accessories; Operating Humidity Range (% RH): 5 to 90% RH, non-condensing; Operating Temperature Range (F): 35 F to 114 F for optimal battery life; Operating Temperature Range (C): 1.7 C to 45.6 C for optimal battery life; Sensor Element: Thermistor; Color: White; Power Method: Battery, Lithium Coin Cell