Topeak panobike speed cadence sensorthe topeak panobike speed cadence sensor is compact easy to mount and quickly connects to the panobike app advanced bluetooth smart ble 40 super low energy consumption wireless speed cadence dual sensor provides real time ride information on your mobile training apps and turns your smartphone into a personal training device unique bluetooth smart algorithm extends battery lifetime up to incredible 1800hours 5 years with 1hrday use panobike spee