The Lezyne cadence speed flow sensor is an advanced 2-in-1 speed and cadence sensor. Advanced 2-in-1 speed and cadence sensor. The Lezyne cadence speed sensor conforms 100% to Bluetooth Smart standards for max compatibility. Its powerful rare earth magnet provides wider engagement spacing. Durable, lightweight polycarbonate construction with translucent body and LED indicators. Adjustable swing arm and versatile mounting system. Replaceable CR2032 coin cell battery optimized for long-lasting use.