Wahoo RPM Cadence Sensor for iPhone and Android
Track and capture cycling cadenceLightweight and easy to install and use - NO MAGNETS!Connects wirelessly via Bluetooth 4.0 or ANT+ to your iPhone or AndroidWorks with the Free Wahoo Fitness App and other popular Smartphone Apps such as Strava, Map My Ride, Cyclemeter & Ride with GPSEasy Mounting: Connects to your crank arm or shoe (both mounts included)