Polar Cadence Sensor Kit SETS UP QUICKLY PROVIDES YOUR PEDAL RPMS FOR QUICK FEEDBACK ON YOUR SPINNING CONTINUOUS CADENCE READOUT WHILE YOU RIDE SIMULTANEOUSLY MONITOR YOUR HEART RATE, SPEED AND CADENCE SIDE-BY-SIDE COMPATIBLE WITH POLAR MODELS: S510, S520, S625X, S710, S710I, S720, S720I, S725 AND S725X