Wahoo Fitness Blue SC: Bluetooth Speed & Cadence Sensor Track and capture real-time speed, cadence and distance on your iPhone, Android, and bike computer. Connects wirelessly via Bluetooth 4.0 to your iPhone, Android and/or bike computer. Works with Zwift and TrainerRoad!Capture cadenceon your favorite indoor cycling platform. Also works with the free Wahoo Fitness app, Strava, RideWithGPS, MapMyRide, Cyclemeter, and more! Lightweight and easy to install, comes with both rubber band and zip tie mounts.Universal fit - works with most bikes and frame sizes.