Polar S3 Stride Sensor is compatible with the RS800 and RS800sd heart rate monitors. Polar S3 Stride Sensor W.I.N.D. features nano technology for highly consistent and accurate speed and distance measurement. It is water resistant, comes with a user replaceable battery and is compatible with Adidas adiStar Fusion running shoe. Going beyond speed and distance to provide insight into the running stride itself, the S3 stride sensor is a durable lightweight module that measures just 55 x 39 x 14mm.b
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