SEKONIC Speed Master Fits in your pocket and allows for easy speed measurement with the push of a button. Use it to measure golf swing clubhead speed, baseball bat swing speed and pitching ball speed, soccer shot speed, etc. Features: ◾︎ 24GHz Doppler radar speed meter (Radio Law certified) ◾︎ Measures swing speed for golf, baseball, tennis, etc. ◾︎ Displays in m/s (meters per second) for golf, and km/h (kilometers per hour) and MPH (miles per hour) for baseball. ◾︎ Uses 2 AA batteries. ◾︎ Simple and easy to use. ◾︎ Compatible with left-handed users. ◾︎ Features a power-off prevention function. ◾︎ Includes a maximum speed memory function. Size: 11cm (height) x 6cm (width) ● Operation confirmed. Power on/off with a long press. ● Will be shipped with new batteries installed. ● May not be able to measure with wooden bats. ● Only the main unit and batteries will be shipped. The image of the instruction manual was borrowed.