Lezyne cadence speed flow sensorthe advanced 2 in 1 lezyne cadence speed flow sensor conforms 100 to bluetooth smart standards for max compatibility the sensor also has a powerful rare earth magnet which provides wider engagement spacing the cadence speed flow sensor is durable and of lightweight polycarbonate construction with translucent body and led indicators featuresadjustable swingarm and versatile mounting systemreplaceable cr2032 battery optimised for long lasting useweight 76gbuyle