Garmin SensorGarmin's sensors attach easily to your bike, letting you monitor your speed and pedaling cadence while your ride and train. There are no magnets or other exposed parts to line up, and the sensors are easy to install, making them great for interchanging between bikes. Compatible with any crank arm size, the cadence sensor lets you know the precise count of pedal strokes per minute. The speed sensor attaches to any hub and self-calibrates, giving you a super accurate read on your speed and distance. Garmin sensors are available individually (Speed or Cadence) or bundled together as a pair.FeaturesMonitor your pedaling and speed with easy-to-install wireless sensorsWarranty: One Year Limited WarrantyManufacturers Part Number: 010-12104-00Compatible DevicesUsers Manual | Garmin Sensor Bike Speed & Candence Sensor Bundle