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ONrhythm 110 Runner's Heart Rate Monitor Watch

Sale price: $24.99 Regular price:
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Sale price: $24.99 Regular price:

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Model: 8301690

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Product Features

A photo of the ONrhythm 110 Runner's Heart Rate Monitor Watch in use

ONrhythm 110 Runner's Heart Rate Monitor Watch is designed for for runners wanting to track their heart rate to regulate their effort

It's easy to regulate your effort using your target zone.

Measurement settings

Stopwatch, measures heart rate in beats per minute (bpm).


Configure your target heart rate zone in beats per minute (bpm).


Watch: 5 ATM (swimming) - Strap: 1 ATM (water splashes).


Readable screen in full sunlight.

Product Customer Reviews

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ONrhythm 110 Runner's Heart Rate Monitor Watch,black
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Stephen owen

Does what it says on the box,if you want Basic HR without the bells and whistles this is the one for you!

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Did not realise need to wear trap around my chest for the heart monitor

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Heart Rate Monitor ON RHYTHM 110

Does not measure accurately after setting up. Sometime it is OK but most of the times it is not especially with the minimum and maximum HR beeping away. It's frustrating.

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Hi Yong Meng,

Thank you for taking time to review our product. We're sorry to learn about the inconsistency of our ONRHYTHM 110 heart rate monitor watch.

Following are the steps to ensure better reception for the HR measurement:
1: Check that your belt is correctly positioned on your body. For a visual aid, please watch this video (
2: Check that you have dampened the sensors on your belt before usage.
3: Check that when using the product, you are away from interference such as power lines, railway, computers etc. as the HR signal can be affected by electromagnets.
4: Check that the battery is still charged.

Also, you may visit this link to ensure correct target heart rate while exercising ( )

We hope the information given would help you resolve the issue. Should the inconsistency persist, we suspect it could be a technical issue, hence, do come down to any of our 4 big stores (SGlab, Bedok, Joo Koon & City Square Mall) to approach our teammates to serve you better.

Thank You.

Yours Sincerely,
Running Sports Leader
Decathlon Joo Koon
Kalenji Heart Rate monitor

Just right cost for right BPM measuring equipment

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You get what you pay for

Used the item for around 6-8 months. Pulse/ Heart rate sensor is not accurate, but it gives you an idea. The band however just fell apart while I was walking. And since it's not your usual watch band type, not really sure on how to go about fixing this. If you can save up for a better watch that serves the purpose, that would be better. If not, this will do.


If the heart rate month would for wrist that be good its a very old technology

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Basic heart rate monitor

Measures heart rate, time at exercise, target zone, live only, does not record session or time in target zone, large easy to read display, shows current heart rate or time of exercise or time of day. Good training aid.

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Heart rate watch

Great product very impressive

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Doesn’t work

Heart rate detected not accurate especially during workout.

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Hi Faizal

Thank you for taking time to review our product. We are sorry to hear about your less than satisfactory experience with our ONRYHTHM 110 heart rate monitor watch .

We suspect the cardio mode on your device has not been properly activated. To remedy this, please attempt the following steps:
1. To activate the cardio mode, you need to go to the "SETTINGS" menu then "CARDIO BELT". If it takes a long time to locate a signal or if the readings seem inconsistent
2. Check that your belt is correctly positioned on your body. Also check that it's the right way round.
3. Check that you have dampened the sensors on your belt.
4. The HR signal can be affected by electromagnetic interference (power lines, railway, computers etc. When using your heart rate monitor, ensure that you stay away from these kinds of interference
5.Check that the battery is still charged. 

For more information, please visit the website below for more in-depth step-by-step instruction to activate the cardio mode of your ONRHYTHM110 heart rate monitor watch. ( )
We hope this information will help you resolve this issue. Should the above steps not work, please do come down to any of our 4 stores (excluding Click and Collect stores- Decathlon Novena and Decathlon Holland Village) to approach our teammates to serve you better. 

Thank you. 

Yours Sincerely
Keqin CHEW
Road Running Sports Leader
Decathlon Bedok, Singapore
doesn't work

there is no communication between watch and heart monitor, item returned

Dear Michal ,
We would like to thank you for getting in touch with us and for bringing this matter to our attention.
We are sorry to hear of your experience at for this product.We understand your concern and we would like to look into this issue and give this feedback to our product manager.
Thank you NOJMUL
Too basic

This does not have even basic features such as showing the avg HR after a workout. All it shows is your heart rate at this moment in time.


Have been using it for about 6 months. Inconsistent in accurately measuring HR. I have seen that about half the time it works great. But there are times when i know for sure the readings are not right. When this happens no amount of resetting the device, fixes the issue.

On rhythm 110 watch and HRM strap

Only recently purchased. Wear at gym during excercise. Reasonably easy to navigate functions, accuracy good. Also works alongside gym equipment.

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Heart rate monitor

Works well and the chest strap even links with my DKN AM-E exercise bike so heart rate shows on the bikes display

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Additional Product Information


Elastic band

  • 35% Rubber - Thermoplastic
  • 30% Spandex
  • 30% Acrylonitrile butadiene styrene
  • 5% Printed circuit board


  • 45% Rubber - Thermoplastic
  • 40% Acrylonitrile butadiene styrene
  • 10% Stainless steel
  • 5% Printed circuit board


  • 100% Polymethyl methacrylate

Why run with a heart rate watch?

Heart rate is measured in BPM (beats per minute). The more intensively you exercise, the faster your heart beats, and the more your BPM increases. As you train, you will learn the best heart rate for you to be able to complete your run without losing your breath. Aim for that rate, and you will be able to run more regularly and more easily.

Set your target zone

Manage your training sessions using the target zone settings. It shows you whether you are in the set zone in real time. With ONrhythm 110, you can set heart rate target zones in beats per minute (BPM).

How is my heart rate measured?

Your heart rate is measured by the strap worn around your chest. The strap has 2 electrodes and a transmitter. When your heart beats, it transmits very weak electric fields. They are detected by the electrodes and sent to your watch via the transmitter on the chest strap.

Can my signal be disturbed by other heart rate monitors?

The ONRHYTHM 100 communicates with the chest strap using a non-coded signal. As a result, they can be disturbed by other heart rate monitors nearby. If you run on your own or with a partner who doesn't use a similar heart rate monitor, it's not a problem! If you run with a group, we recommend you choose a coded heart rate monitor, such as the ONRHYTHM 500.

Easy to read in the sun and in the dark.

The ONRHYTHM 110 has what is known as a reflective screen. It reflects the surrounding light. The more sun there is, the easier it is to read the screen! When running in the dark, you can use the backlight button to light your screen.

It's a watch too!

The ONRHYTHM 110 watch also tells the time and date. You can also set an alarm.


Watch: CR2032 included - Strap: CR2032 included


Thickness 12 mm | Diameter: 43 mm Weight: 1.5 oz

Warranty and after-sales service

The DECATHLON products are guaranteed for 2 years. If you have any questions, go to our support website. You will find advice on how to use your product properly: instructions, questions frequently asked by our users and video tutorials. In order to give you the best possible support, the support team is at your disposal 24 hours a day to answer your questions.

Use restrictions

This watch is designed for sport and leisure. It's not a medical device. The information provided by the watch is for information purposes only and must not be used to track a pathology.



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Size Guide Visual