This racquet is Sony Smart Tennis Sensor compatible.HEAD has recreated the Graphene XT Instinct S with new cosmetics and the introduction of Graphene XT. Maintaining its full ounce lighter weight puts the S in a completely different player category than its heavier sibling. This racquet is made for players with noticeably slower swing speeds and who need the racquet to “help” them a little bit more to generate power. The Instinct's lighter weight allows it to be more easily swung, and its wider beams provide a stronger response off the strings, creating greater power potential. HEAD re-engineered the application of the world’s strongest and lightest material to make their Graphene XT racquets 30%* stronger providing an optimized weight distribution for a faster swing and more power. By using graphene XT in the racquet shaft, HEAD has been able to move weight from the shaft to the tip and handle, increasing power and stability without changing overall racquet mass (more weight in the head provides greater plow through from the baseline, and more mass in the handle reduces torque and recoil). All-court and baseline players with slower swing speeds should demo the Head Graphene XT Instinct S to feel real, controlled power.