Caldwell Wind Wizard II - Both compact and portable, this wind meter reads wind and temperature in various units of measure. The non-slip rubber sleeve protects the unit and ensures its easy to grip even with gloved hands. Operates on one CR2032 battery (included). Wind speed measures in mph, feet per minute, Kilometre per hour, meters per second or knotsWind chill displayTemperature display in Celsius and FahrenheitLCD backlightNon-slip protective rubber sleeveOperates on one CR2032 battery - Included Auto power off