Advanced 2-in-1 speed and cadence sensor. Conforms 100% to Bluetooth Smart standards for max compatibility. Powerful rare earth magnet provides wider engagement spacing. Durable, lightweight polycarbonate construction with translucent body and LED indicators. Adjustable swingarm and versatile mounting system. Replaceable CR2032 coin cell battery optimized for long-lasting use. Includes O-ring mounts, spoke magnet, crank arm magnet.