Professional weather station with solar powered transmitter using 2 AA rechargeable batteries. Features a USB port for easy connection to your PC as well as indoor and outdoor temperature display in degrees Fahrenheit or Celsius. Also has weather alarm modes for temperature, humidity, wind chill, dew point, rainfall, wind speed, air pressure, storm warning. Free standing or wall hanging. Compatible software operating systems include Windows NT4 (SP 6a or above), Windows 2000, Windows XP, Vista, Windows 7.