$259.99
Polar's S-520 is a superb training tool for everyone from cycling enthusiasts to triathletes and bike racers. It keeps track of running and swimming workouts thanks to waterproofing and numerous lap timers. Copious cycling feedback is provided via a wireless speed sensor while a distance-based interval function guides you through your toughest workouts on the bike. And Polar's SonicLink technology lets you download heart-rate and cycling data, as well as maintain a training log.
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