The Bushnell velocity is a multi functional speed gun for all kinds of sports enthusiasts. Clock tennis serve speeds, baseball pitches, downhill skiers, cars (up to 200 mph) with incredible accuracy. Easy to use - Bushnell point and shoot pistol grip, a large, clear LCD radar gun display displays fastest speed once trigger is released, a laser radar with +/- one mph accuracy, and the it requires 2 C batteries (not included).