Perpetual calendars before 2099 User selectable Sunday in 7 languages: English, German, Italian, French, Spanish, Dutch and Danish two daily alerts Automatic sleep function (off or 5~60 minutes) temperature: - Indoor temperature measurement range: 0°C (32°F) to 50°C (122°F) - Outdoor temperature measurement range: -40°C (-40°F) to 70°C (158°F) humidity: - Indoor and outdoor humidity measurement range: 20% to 95% air pressure: - Air pressure range: 600 to 1100 hPa (17.72 to 32.48 inHg or 450 to 825.1 mmHg) rain - Rain range: 0 to 9999mm (0-393.6 inches) wind - Wind speed range: 0 to 180 km/h (0 to 111 mph) - Wind direction range: 0 to 359 degrees Wireless Outdoor Sensors: -433.92MHz RF transmission frequency - 100m (300ft) transmission range in an open area, not including walls or floors. Temperature, humidity, wind speed and rainfall records Temperature, Humidity, Wind Speed, Rainfall Alerts Displays feel temperature, wind chill temperature, heat index, dew point temperature Weather forecast function 3-level display backlight USB charging function power supply: weather station: Power adapter: DC5V1.2A Batteries: 2 x LR6 AA 1.5V Multi-combination wireless remote sensor: Batteries: 3 x LR6 AAA 1.5V F. Year: The wireless remote sensor works in temperatures from -30°C to +70°C. Please choose the appropriate battery according to the extreme temperature of the wireless sensor: Alkaline zinc manganese battery can work at -20°C to +60°C The polymer lithium-ion rechargeable battery can operate from -40°C to +70°C.