The Low Priced Champ: Gives Numbered Shot Velocities. Keeps velocity on the digital display until you shoot again. Uses 9 Volt alkaline battery with 48 hours of continuous use. Has a stereo jack for optional remote control or printer. Can use an optional remote control ($13.00) to upgrade the F-1 to an Alpha Chrony with the exception of ft/sec to meter/sec convertibility. Comes with a LCD display that sits on your bench for easy viewing.