Similar to a tennis ball machine, this automatic table tennis trainer serves a steady stream of balls for solo practice to fine tune one's game. A turn of a knob selects one of three spin settings: Underspin (where the ball rotates away from the player, requiring a chopping stroke to return); Topspin (where the top of the ball rotates toward the player); and a challenging Heavy Topspin (high rpm rotation that must be returned with a controlled downward stroke). The trainer holds 110 balls and, with an adjustable speed dial, delivers them at any rate from 12 to 70 per minute. Sets up on a standard table tennis top and is powered by the included AC adapter with 4 1/2' cord. Balls not included. 19" H x 11" Diam. (10 lbs.)