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Polar Verity Sense optical heart rate monitor sensor provides alternative to chest straps - Bikerumor
Polar - 50% BATTERY LIFE INCREASE! 🚨 With the latest software update, Polar Verity Sense brings 30 hours of battery life to ensure that you measure every move without fear of running
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Amazon.com: HQRP 3 Pack Lithium Coin Battery Compatible with Polar Fs2, F11, F55, A2, S710 Heart Rate Monitor Plus Coaster : Sports & Outdoors
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