Weather Clock Transparent ABS Wireless Multifunctional Temperature Alarm Clock with Color Screen Item Type: Weather Clock Material: ABS Weight: Approx. 453g/16.0oz Clock Size: Approx. 15.5x6.4x9.6cm/6.1x2.5x3.8in Sensor Size: Approx. 5x2.6x9.7cm/2.0x1.0x3.8in Plug: USB Battery: Dry battery, AAA x 2 (weather clock), dry battery, AA x 2 (sensor) (shipped without battery) Humidity: The indoor and outdoor measurement range is 20% to 95% RH Temperature: Indoor Temperature Measurement Range: minus9.9°C(14.2° F) to 50°C(122° F) Outdoor Temperature Measurement Range: minus40°C(minus40° F) to 70°C(158° F) The unit of temperature can be °C or °F Outdoor Thermometer Alarm Atmospheric Pressure: Atmospheric Pressure Measurement Range: 850 hPa/mb to 1100 hPa/mb (25.10 inHg to 32.48 inHg) Pressure Unit: hPa/mb or inHg