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Polar RS300X Heart Rate Monitor Black

Polar RS300X Heart Rate Monitor Blakc
Polar RS300X Heart Rate Monitor Blakc Polar RS300X Heart Rate Monitor Orange
Polar RS300X Heart Rate Monitor Black

Get race day ready with the Polar RS300X Heart Rate Monitor. It's packed with essential running features to help you monitor your progress and maximize your training.



Smarter Training Starts Here

When you train, you don’t always have to go faster or harder to get the best results. To reach your goals you just need to train within the right heart rate intensity zone.

A heart rate monitor will help guide your training so every workout counts.

  • Helps you train at the right intensity with personal sport zones
  • Compatible with Polar speed and distance sensors (sold separately)
  • Polar Fitness test measures your aerobic fitness at rest and tells you your progress
  • Average and maximum heart rate of each lap
  • Automatic lap recording
  • Time and distance based interval timers
  • Water resistant – 50m (suitable for swimming)
  • Syncs to online training diary with FlowLink (sold separately)

Smart Coaching Features

  • Fitness Test

    Fitness Test

    Tells you exactly how your fitness is developing.

  • Training load

    Training load

    Shows you how your training affects your body

  • OwnZone


    Guides you to train at the right intensity.

  • Smart Calories

    Smart Calories

    Lets you know exactly how many calories you’ve burned.

Watch Features
  • Backlight
  • Date and weekday indicator
  • Display text in English, German, French, and Spanish
  • Dual time zone
  • Button lock
  • Low battery indicator
  • Time of day (12/24h) with alarm and snooze
  • Water resistant – 50m
Additional Information

Additional Information

Brand Polar
Available Outside the UK? Yes
In the Box

Whats in the box

Polar RS300X training computer
Polar H1 heart rate sensor
RS300X Getting Started Guide