The ANT + speed & cadence sensor combines digital radio transmission for cadence and speed . Placed on the chain strut, it takes up the speed via the supplied spoke magnet, while the magnet, which is also delivered with the crank, passes the cadence to the bicycle computer. The data are transmitted using the ANT + standard, which allows a distance of up to 4 meters between the sensor and the tachometer, while at the same time providing interference-free transmission. The speed / cadence combination ANT + speed & cadence can be retrofitted with all digital O-Synce bicycle computers.This includes the urban series, the coachsmart, the Macro-X series and the MIXpro multi-sports watch.