Used but works great
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 Activity Trackers
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Polar M430 Review + Discount, Detailed
You dream. You plan. You train. And now you want to take the sports you compete in more seriously.Polar Pacer Pro is a new-generation sports watch for serious training. It has a new integrated antenna design for improved GPS tracking, training tools you'll actually use, plus personalized recovery and sleep apps that increase your chances of performing at the your best. With ultra-light design, bright display, and barometer, you can harness your power to compete in any sport.
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Polar M400 review