All you need for cycling data, all together at once! The Wahoo RPM Speed and Cadence Sensor Combo Pack, is a sleek, wireless, and magnet-less solution. Each mounts easily to your bike and the Bluetooth Smart and ANT+ duel band technology allows you to connect and display data on both smartphone and bike computers, with both sets of information on the screen at the same time. The speed sensor mounts to your hub, and the cadence sensor mounts to your bike\\\'s crank arm or to your shoe. Collecting and tracking this data has never been so easy!