The Wahoo RPM cadence sensor is your sleek little solution for measuring cycling cadence data. It is wireless, magnet-less, lightweight, and easily mounts to your bike’s crank arm or to your shoe. Bluetooth Smart and ANT+ dual band technology allows you to connect to and display data on both smartphones and GPS bike computers. Collecting cadence data has never been this easy. Packaging content: RPM Cadence sensor CR 2032 Battery (installed) Rubber Mounting Option Zipties Shoe Mount Option 3M double sided tape Quick Start Guide Important Product Info Guide