Feature: 1. The Thermometer: The indoor temp displayed is measured by the main machine, while the outdoor temp displayed is the data received from the outdoor sensor. 2. Higher Accuracy: Comes with wide measurement range in sensing the temperature, humidity and atmospheric pressure, the weather forecast is near at hand. 3. Premium Monitor: Able to show various weather condition such as sunny, cloudy, light rain, heavy rain, light snow, heavy snow, etc. to help you make plan. 4. Other Functions: Moreover, the weather clock has outdoor high and low temperature alarm, 24 hours maximum and minimum value record and other functions. 5. Simple in Using: The whole operation is very convenient and the noise is low. Suits perfectly for home, office, classroom, hotel, meeting room and more. Specification: Item Type: Weather Clock Material: ABS Product Size: Approx. 16.7 x 12.9 x 2.9cm / 6.57 x 5.08 x 1.14in Indoor and Outdoor Humidity Measurement Range: 20%RH ~ 95%RH Indoor Temperature Measurement Range: -9.9℃ to 50℃, that is 15℉ to 122℉. Outdoor Temperature Measurement Range: -40℃ to 70℃, that is -40℉ to 158℉. Temperature Units: ℃ or ℉ alternative. Alarms: Outdoor thermometer alarm, outdoor temperature high and low temperature alarm as well as frost alarm. Data Recording: Can record the minimum and maximum values of air humidity and temperature in 24 hours. Outdoor Display: Indoor comfort and safety display. Wireless Outdoor Sensor: 1. Can be installed on the wall or placed on the table; 2. 433.92MHz RF transmit frequency; 3. Transmission range of 60 meters in open area; 4. Up to 3 wireless outdoor sensors can be connected, and the product only contains 1 wireless outdoor sensor. Atmospheric Pressure Measurement Range: 600 hPa/mb to 1100 hPa/mb, that is 17.72 inHg to 32.50 inHg. Atmospheric Pressure Unit: hPa/mb or inHg alternative. Pressure Display: Bar graph showing historical trend of atmospheric pressure over 24 hours. Weather Clock Battery: 2 x AA, delivered without battery. Sensor Battery: 2 x AA, delivered without battery. Weight: 487 g / 17.18 oz(approx.). Package List: 1 x Weather Clock1 x USB Power Cable1 x Sensor1 x User Manual