|adidas micoach Speed Sensor for iPhone/iPod||Price: $69.99|
For iPod and iPhone
You can finally track your movement on the tennis court with the adidas miCoach Speed_Cell. Simply attach the lightweight Speed Cell to your shoe and hit the courts. That's it! Turn your iPod or iPhone into a data-crunching performance analyzer. Easily plugs into your device and captures all measurements of your performance so you can see where you're at and break past those old PBs.
Select a training program and get coached every step of the way by WTA star, Andrea Petkovic. Whether you're playing in a match or just practicing, miCoach will collect your statistics. Share and compare your results with your friends via Facebook or Twitter.