Players use real aluminum bats, without wires to swing at virtual pitches. Relying on infrared sensors...this simulated Home Run Derby accurately measures human motion. Scores are determined by hitting distances in an operator-definable number of pitches. The distance is counted from the moment the ball hits the ground. As balls are hit, the player's perspective (the camera) follows the ball into the field or into the stands if the player hits a home run. Players can work their way from Rookie, through the different levels of the minors, all the way up to "the show'" as their skills improve. 20'Lx15'Wx11'H - 20amps & 5amps req.