Transform your iPhone into a powerful cycling computer with the Wahoo Blue SC for your iPhone 5S, 5C, 5 and 4S. The Wahoo Blue SC connects wirelessly via Bluetooth Smart (4.0) to your iPhone and tracks your cycling speed, pedaling cadence, and distance through the free Wahoo Fitness App, and other popular Apps such as Cyclemeter, Strava, MapMyRide and Runtastic Road Bike. The Blue SC mounts on the rear chain stay and uses spoke and crank magnets to track bike speed and pedal rotations per minute. Additionally, use the free Wahoo Fitness Odometer app to track the lifetime mileage of your bike by week, month, and year.