Ecowitt Wittboy Pro HP2564 7 in 1 Weather Station with Display Console
Wind speed ranges from 0 to 40 m/s with an accuracy of ±0.5 m/s for speeds under 10 m/s and ±5% for speeds over 10 m/s. Power is supplied via a built-in 6.5V/4mA solar panel and two AA 1.5V batteries (not included) for backup.