Wahoo RPM Speed Sensor

The Wahoo RPM speed sensor is your sleek little solution for measuring cycling speed data. Features: It's 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. Dimensions: 3,2cm x 1,9cm x 2,5cm. Weight: 7 grams. Battery: CR2032. Water Rating: IPX7.