Accessories and Replacement parts designed to work with Polar CS Speed Sensor which are sold separately
Part number 91028735
Compatible with Polar:
CS Speed Sensor (sold separately) which works with CS100s, CS200s, CS300s, CS400, CS500 RS800CX (sold separately)
Easy-to-attach magnet set for an easy and quick replacement.
Polar Magnet Set for CS Speed Sensor 91028735$8.95