Wahoo RPM Sensor for iPhone, Android and Bike Computers Track and capture real-time cycling cadence on your iPhone, Android, and bike computer. Water Rating: IPX7 waterproof up to 5 feet Lightweight and easy to install - NO MAGNETS. Easily attaches to your bike's crank arm or shoe - (both mounts included). Connects wirelessly via Bluetooth 4.0 and ANT+ 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!