Polar M400: Running and activity tracking in one (pictures) - CNET

Polar M430 first take review: It's an Olympic coach for your wrist - CNET

Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET

Polar M400: Running and activity tracking in one (pictures) - CNET

Polar M400 GPS & Activity Tracker Watch In-Depth Review

Polar M400 Review, Detailed, Discount Links

Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET

Motorola Moto 360 Sport review: Don't be fooled by the name -- it's not for athletes - CNET

Polar M400 Review Tested by GearLab

Polar M400: Running and activity tracking in one (pictures) - CNET

Garmin Vivoactive review: Garmin's first fitness smartwatch misses the mark - CNET

Activity Tracker Polar M400 - GPS Running Watch

Polar M400 Review: Fitness/Sleep Tracker Watch With GPS

Review: Polar M400 Fitness Tracker Watch