All-in-One Features: Color weather forecast; indoor/outdoor temperature and humidity; min/max temperature and humidity display; air pressure; DCF radio-controlled clock; moon phase; alarm and snooze function; 3 brightness levels for backlight; connection with 3 remote sensors. Easy-to-Read Display: All information is easily readable from any angle. Indoor/outdoor temperature and humidity are displayed with large, easily recognizable numbers on the digital display. Weather forecasts are based on atmospheric pressure, with an outdoor radio sensor. Thermometer, Hygrometer, and Barometer Function: Displays indoor/outdoor temperature and humidity, optionally in C or F; MIN/MAX display for humidity and temperature; displays atmospheric pressure, humidity, and temperature trends; outdoor frost alarm warns when the outdoor temperature is between 1°C and 2.8°C; 3 remote sensors allow the weather station to display data from up to 3 different rooms. USB Features, Atomic Clock, and Alarm: USB port for charging electronic devices, automatic or manual time adjustment, optional time selection in 12/24-hour format and time zone, T-shaped alarm with easy on/off and snooze function, low battery display when used with battery only, simple moon phase display. Requires 2 AA batteries (not included) or DC power (included). When using the power adapter, the backlight is active and can be adjusted to 5 brightness levels. If you only use batteries, the screen is harder to read without backlight. For this, the backlight can be activated for 15 seconds by pressing the "Light" button.