AcuRite 02081M Weather Station with Jumbo Display and Atomic Clock Oversized color weather station with large digits.Unit is powered by an AC adapter with battery back up. Atomic clock technology ensures split-second accuracy, and automatically updates for daylight saving time 12 to 24-hour weather forecast displays 14 different icons to help you plan the day ahead Patented self-calibrating forecasting pulls data from a sensor in your back yard to give you the most accurate forecast for your exact location Daily high and low records for indoor and outdoor temperature Strong wireless range up to 330 feet (100 meters) and the device transmits data every 16 seconds and is perfect for indoor or outdoor use