Manage your practice & match data from your smartphone or tablet with the Zepp Tennis 3D Motion Sensor. Detailed data The Zepp Tennis 3D Motion Sensor attaches to the handle of your tennis racket to let you track the number of forehands, backhands, serves & smashes you hit during games & practice. You can also see how much power you generate & track the number of topspins, slices & flatshots you have played. All this information is viewable on the free i OS & Android app numerically or via charts & trends for accurate assessment after playing. Simple to use Getting started is easy: simply attach the sensor to your racket, connect the sensor to your device via Bluetooth & start playing. The 3D Motion Sensor can also be used for golf & baseball. All you need is an additional adapter (sold separately). Stay on top of your game with the Zepp Tennis 3D Motion Sensor.