Wahoo Bike Pack - ANT+ Bike Case for iPhone with Speed and Cadence Sensor - 3, 3GS, 4, 4S Fits iPhone 3G, 3GS, 4, 4S from all carriers! Ships with custom rubber liners to easily adapt between phone types Bike Case includes a built in ANT+ radio transceiverwith support for all current and future ANT+ sensors, inclusive of power and heart rate monitors Works with the top cycling Apps such as Cyclemeter, LiveCycling, MapMyRide, Runtastic Road Bike, Strava, and RaceMyGhost Bike mountwith quick release for Case/semi-permanent mount attachment to bike; Adjustable portrait or landscape orientation MicroUSB port for charging/data connection with tethered rubber plug when not in use; Water and shock resistant