The Acurasee® Rectangle Target is used in conjunction with the Elite Electronic Tennis Scoreboard. Use of the Acurasee® Rectangle Target encourages players and coaches to think about the most important element in tennis - where will the shot hit the court. The Acurasee® Rectangle Target encourages players to have a specific shot location in mind whenever they hit a stroke. This product includes the Acurasee® Rectangle Target, Carrying Case and Transmitter. Please note you must also purchase the Elite Electronic Tennis Scoreboard (#HAC100) for the electronic feedback to work.