Polar S-Series Speed Sensor

Polar S-Series Speed Sensor: Transmitter for bike wheelSends bike speed to HRMCompatible with the Po

Polar S-Series Speed Sensor: Transmitter for bike wheelSends bike speed to HRMCompatible with the Polar S10, S20, S510, S520, S710i, S720i, S625x and S725x heart rate monitorsIncludes Polar handlebar mount

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