Time/date display. Perpetual Calendar Up to Year 2099 Eight-nation week language selection (English, German, French, Italian, Spanish, Dutch, Danish, Russian) Double alarm and snooze function (the alarm time, alarm cycle, snooze time and number of snoozes can be set) Warning functions such as upper and lower limits of temperature and humidity, upper limit of wind speed and upper limit of rainfall Display of somatosensory temperature, wind chill index, thermal index and dew point temperature (converted from temperature and humidity, air pressure, wind speed, etc. detected in the machine) ASK receives remote transmitter signal (100m signal transmission) 3 brightness backlight (brightness can be adjusted when powered by USB, and the screen can only be lit for 15 seconds when powered by battery) Specifications: Indoor temperature detection range: 0 ~+50℃(32 ~ 122℉) Indoor humidity detection range: 20 ~ 95% Indoor temperature and humidity detection cycle: 60S Outdoor temperature detection range: -40 ~+70℃(-40 ~ 158℉) Outdoor humidity detection range: 20 ~ 95% Air pressure detection range: 600 ~ 1100HPA (17.72 ~ 32.48INHG & 450 ~ 825.1mmHg) Wind speed detection range: 0 ~ 180 km/h(0 ~ 111 mph) Wind direction detection range: 0 ~ 359 degrees Rainfall detection range: 0 ~ 9999mm & 0 ~ 393.7in Host power supply: USB cable powered DC 5V1.2A/battery: 2 * AA batteries (not included) Outdoor Sensor power supply: 3 * AA batteries (not included)