RainWise WindLog High Capacity, Low Cost Wind Data Logger & PC Software 2 MB of flash memory stores over a years worth of wind data at a 10 min logging interval. Operates on 3 AA Alkaline or Lithium batteries. USB port provides fast downloads. Uses USB power when connected to a computer. Free Windows software Logs average speed, wind gust and average direction. User selectable logging intervals from 1 minute to 1 hour.