Measure indoor and outdoor temperature and humidity. Maximum and minimum temperature and humidity records query. Outdoor sensor via wireless transmission(open space distance greater than 30m). Wireless transmission makes it possible for outdoor temperature to display on the indoor receiver. Multiple functions: alarm, snooze, calendar, weather forecast. 2 temperature units for choice: Celsius(°C) or Farenheit(°F). 3 RF channels selection, set the corresponding channel and then can connect with each other. 12 hours or 24 hours format selection. The LCD screen with color backlight display, enjoyable to read. With hanging hole on the outdoor sensor to hang on the wall.