VeloComputer Smart Sensor works without any magnets. VC5CRANK sensor calculates crank motion with unmatched accuracy. It measures crank position with 5-degree precision. This precise data is used to calculate cadence and crank position. VeloComputer Smart Sensor supports standard Cadence ANT+ and Bluetooth profiles. It can be wirelessly updated for new REVolution profile for higher accuracy (supported only in VeloComputer Android application). Unlike accelerometer based sensors VeloComputer Smart Sensor is not susceptible to any shock or vibration. It works reliably everywhere on earth, except for the North Pole. The sensor can work with apps and devices supporting standard ANT+ and Bluetooth Smart cycling speed and cadence profile. For iPhone users we recommend CatEye app.