Weather Clock 3 Channel Indoor Outdoor Thermometer Wireless Temperature and Humidity Monitor Weather Forecast Clock Item Type: Weather Clock Material: ABS Size: Weather Clock: Approx. 9.7x15.2x4.5cm/3.8x6x1.8in Sensor: Approx. 5x9.6x2.5cm/2x3.8x1in Weight: Approx. 445g/15.7oz Use: Weather clock Battery: Weather clock, sensor, dry battery, AA x 2 (shipped without battery) Indoor and Outdoor Humidity Measurement Range: 20% to 95% RH Temperature: Indoor Temperature Measurement Range: -9.9℃ (14.2℉) to 50℃ (122℉) Outdoor Temperature Measurement Range: -40℃ (-40℉) to 70℃ (158℉) Temperature can be switched to ℃ or ℉ Outdoor Wireless Sensor: 3 channels can be connected 433.92MHz RF transmission frequency Up to 60 meters transmitting distance in open area