Wind Speed MAX & Average Wind Speed Since Power On Beaufort Scale Bar Graph (0-12) Wind Chill (°F or °C) Temp (°F or °C) Backlight with Auto Off Battery Saving Auto Off Neck Band Included for Easy Carrying Dimensions: Receiver: 4" x 1.63" x .7" All Features: Wind Speed (mph, km/h,m/s, Knots) Displays MAX & Average Wind Speed Since Power On Beaufort Scale Bar Graph (0-12) Wind Chill (°F or °C) Temperature (°F or °C) Backlight with Auto Off Battery Saving Auto Off Neck Band Included for Easy Carrying Specifications: Maximum measured speed : 67 mph Minimum measured speed : 0.44 mph Resolution-wind speed : 0.1 for all units Temperature measuring range : -21.8 to 138.2 °F/ -29.9 to 59 °C Resolution-temperature : 0.2°F/ 0.1°C Power requirements : 1 CR2032 button cell