Onrhythm 500 HRM Watch and Bluetooth Chest Strap - Red



Made for athletes who want to measure their heart rate and make progress
Make easy progress with the interval training mode and the exercise intensity indicator.
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Parameter measurementStopwatch, Heart rate (BPM and %HRmax), calories
Ease of useBluetooth coded transmission: no crosstalk with surrounding monitors
WaterproofWatch: 5 ATM (swimming) - Chest strap: 1ATM (water splashes)
CoachingTarget zone (BPM or %HRmax) - Intensity indicator - Interval training - Lap time
User comfortTextile HRM chest strap for enhanced user comfort.
Warranty2 Years
Technical Information

Measurement set-up
Stopwatch, heart rate (BPM and %HRmax), instant and total calorie expenditure.
Target zones
You can set up target zones for better management of your training. A graphic indicator shows you, in real time, whether you are within the target zone you have set up. The ONrhythm 500 lets you set up heart rate target zones (in BPM or %HRmax).
Exercise intensity indicator
ONrhythm 500 automatically displays, in real time, your exercise intensity based on your heart rate: very light, light, moderate, hard or very hard exercise.
Information / Concept / Technology
Wrist : 90.0% Polyurethane (PU), Wrist : 10.0% Stainless steel Structure : 70.0% Polycarbonate - Acrylonitrile Butadiene Styrene (PC-ABS), Structure : 30.0% Stainless steel Inside room : 100.0% Printed Circuit Board Lens : 100.0% Polymethyl Methacrylate (PMMA)


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Used for 2 to 8 weeks
great piece of kit, works all the time, no issues
Difficult to connect!
Used for 2 to 8 weeks
It always took me sooooo long to connect! Once it is connected, it will hang after around ten mints and connect again! So difficult to use!
Response of the brand

I'm sorry to hear that you have had issues connecting to your Onrhythm500 HRM.

There are two points you can check:

Do you moisten the sensors on your belt?
Is the batter well charged?


If you are able to return to store we can offer check with a replacement battery for you or offer an exchange or refund. 

Kind regards, 

David Daker
Market Manager Nutrition,
Electronics and Accessories,
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