The Babolat POP is an incredible and fun new technology. I received it as a birthday present a few weeks ago and have been obsessed with it. POP is compatible with my iPhone. IG+笻m very competitive, so I enjoy challenging my friends and family to see who can get the highest score. I can even see where I rank globally. It tracks the type of shot you hit, the speed of it, and the amount of spin. All of that combined create the PIQscore. It also tells your best serve, best/longest rally, play time, activity score and more. All of this info gives my coach and I a different way to study and improve my game. I play with a Babolat racquet, but itG+笻s great that the wristband works with any racquet. IG+笻m looking forward to seeing how this cool, new technology helps me as I compete in USTA tournaments this spring.