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Best Choice POLAR 
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Heart Rate Monitor Fitness Sensor Bluetooth with Chest Strap Tracking LED Light • LED Light : The LED light on the chest strap provides visibility and convenience during low-light workouts. LED LightBest Value Magene 
Magene H303 Heart Rate Monitor, Heart Rate Sensor Chest Strap, Protocol ANT+/Bluetooth, Compatible with iOS/Android APPs New Design: Newly designed hardware and algorithms avoiding the noise interference caused by movement and sweating，helpCooSpo 
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