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TECHNICAL SPECIFICATION RS300X

Both heart rate monitor and heart rate sensor are suitable for bathing 

and swimming (water resistance 30 m) as long as buttons are not 

pressed under water.

Battery type   

CR2032

Battery life 

 

11 months (1 h of training per day)

Operating temperature 

-10 °C to +50 °C / 14 °F to 122 °F

Back cover 

  

Polyamide

Wrist strap 

  

Polyurethane

Wrist strap buckle  

Stainless steel

  

H1 HEART RATE SENSOR

Battery type and life 

CR2025, 1500 hours of use 

Operating temperature 

-10 °C to +50 °C / 14 °F to 122 °F

Connector material 

ABS

Strap material  

Polyamide, Polyurethane, Elastane, Polyester

Water resistance 

30 m. 

1. Lever the battery cover open by using the 

clip on the strap.

2. Insert the new battery inside the cover 

with the negative (-) side outwards.

3. Align the ledge on the battery cover with 

the slot on the connector and press the 

battery cover back into place. 

If you need more help with this, see the full

user manual at 

polar.com/support

For safety reasons, please ensure you use the correct battery.

Polar RS300X

GETTING STARTED GUIDE

Manufactured by

Polar Electro Oy

Professorintie 5

FI-90440 KEMPELE

Tel +358 8 5202 100

Fax +358 8 5202 300

www.polar.com

Compatible with Polar products and 

many pieces of gym equipment using

FIND PRODUCT SUPPORT

17953249.00   ENG   07/2014   WINLEE / 10011

Gym

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STAY TUNED WITH POLAR

English

polar.com/support/RS300X

USING POLARPERSONALTRAINER.COM

When you transfer training results from your training computer to 

your Diary, you can easily follow up your training as well as plan 

your future training sessions. You need the Polar FlowLink data 

transfer unit (sold separately) to transfer your training information.

In polarpersonaltrainer.com you can easily analyze your training 

data and see perfect balance between training and resting from the 

Training Load curve.

OWNZONE

Polar OwnZone® determines your personal heart rate limits for a 

training session. Depending on the day and time, your physical state 

may vary, for instance, if you are stressed or tired, or if you are not 

fully recovered from your latest training session. Polar can determine 

that information from your heart rate and guide you to your ideal 

training zone for that moment.

INTERVAL TRAINER GUIDED WORKOUTS

Create interval workouts based on time, heart rate, speed/pace or

distance and get guidance during your training. You need a G1 GPS 

Sensor or a S1 foot pod for measuring speed, pace or distance. If you 

bought your RS300X without the required accessory, not to worry, 

you can always buy one later.

FITNESS TEST

With Polar Fitness Test you can determine your fitness level in just 5 

minutes. The test calculates your maximal oxygen uptake (VO

2max

based on your personal information as well as your resting heart rate. 

By regularly comparing your test results you can see how your fitness 

improves over time. Repeat the test every 6 weeks and see how you 

progress.

KEY FEATURES

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