This is the only table tennis scorekeeping system that automatically tallies points. The system consists of a net and post set, an LED scoreboard, rail-mounted control unit, and two precision vibration sensors that attach underneath the table. The sensors detect vibrations made when the ball strikes the tabletop and instantly send this data to the scoring unit, which translates it into a real-time display of the score. The system not only tracks and displays the score, it also verbally announces it and informs players when it is time to change service. Requires four AA batteries. Scoreboard 12" L x 8 3/4" W x 7 1/4" D. (3 lbs.)