By attaching the Smart Tennis Sensor to your racket, all your shot data are recorded and can be displayed in real-time on your smartphone via Bluetooth. Through the app screen, you can check the swing (shot) type, ball speed, swing speed, ball spin, ball impact spot and other data for every shot. All recorded data are stored on your smartphone and sorted by shot type. Play reports are automatically created so that you can look back and analyze your tennis game. From the more detailed screen, you can view your play data over time. The Live mode video function records each shot data together with actual video footage. This allows you to look closely at your shot data after you are done playing. Also, you can learn a lot about improving your tennis by watching your form and shot placement about your shot data. What would you prefer tracking the most with the Sony Smart Tennis Sensor?