Use this interactive system to turn your PC into your own local weather center. Its PC Weather Analyzer software graphs weather data and lets you see day-to-day and year-to-year trends. Mount the included weather sensors on a roof, fence or antenna, and they'll transmit data up to 200 ft. to the indoor receiver/display. The LCD displays information in U.S. or metric units and is powered by an included AC/DC adaptor. Minimum and maximum values are stored in memory. Use of optional lithium batteries (not included) in the transmitter will enable use in temperatures as low as -40°F. The unit records wind speed and direction, wind chill factor, rainfall, barometric pressure, pressure tendency over 24 hours, a forecast based on 72-hour pressure tendency, indoor and outdoor temperatures, along with the time and date with an alarm clock function. The software for the PC interface tabulates and displays monthly and annual rainfall, wind gusts and more.