* Amazon.co.uk Sales Rank: #5663 in Sports & Outdoors(12/2009)
* Brand: Polar
* Model: S3
* Dimensions: .79" h x 3.94" w x 11.81" l
* Weight: 2.00 pounds
* Compatible with all Polar 800 series units
* Measures speed and distance
* With interference-free speed/pace and distance data you're able to evaluate and analyze your individual performance accurately
* User replaceable battery
This small and lightweight durable sensor measures each stride you take, helping you analyse the effectiveness and efficiency of your run...Read More