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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 with Heart Rate Monitor (Black) : : Sports, Fitness & Outdoors
Own Your Fitness Goals With The Polar M400 HR Watch
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Polar M400 GPS Sports Watch with Heart Rate Sensor, Black
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StrapsCo Rubber Protective Case for Polar M400/M430
Polar M400 sports watch with H7 sensor (WHITE)
Polar M400 Review Tested by GearLab
Polar M400 GPS running watch with H7 Bluetooth Smart HR Sensor is an exceptional blend of sporty design, integrated GPS and advanced training
Polar M400 GPS Sports Watch, Activity Tracker, Heart Rate Monitor + 7-in-1 Fitness Kit
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