It features a radio controlled clock so you'll never need to worry about setting the time. The LCD display shows indoor and outdoor temperature and humidity. The unit can take up to 5 wireless sensors (1 included) making it ideal if you want to monitor the temperature and humidity around the house and garden. The unit incorporates an alarm with snooze and the pre-alarm function to warn you if the temperature has dropped outside to a pre-determined temperature. Ideal as it will wake you a few minutes earlier to scrap the ice off your car.