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Precise measurement and total comfort
Compatible with any Bluetooth heart rate monitor - and up to three simultaneous connections to different devices. Up to 38 hours (a day and a half) of continuous and accurate heart rate tracking. Comfortable to wear and an unprecedented secure fit without any slipping. No buttons and automatic detection of wearing on the skin.


Wearing comfort
Design that also thinks about women
Hand on heart – wearing a chest strap is not very comfortable. It often slips during longer workouts, rubs the skin and is a hindrance for women in combination with a sports bra. COROS Heart Rate Monitor brings high comfort: it does not interfere, does not restrict and stays in place even during long loads. Pleasant fabric, precise adjustment with Velcro and a smooth design that does not catch on clothing.
Unisex design. Comfortable to wear on the shoulder without shifting, pleasant fabric and precise fit. Maximum comfort even for women for whom wearing a chest strap is not ideal.
Strategic placement. Wearing it on the shoulder has its advantages – it allows for more accurate measurements due to the greater amount of muscle mass and dense network of blood vessels beneath the surface.
Battery life
Up to 38 hours of measurement
COROS GPS watches are known for their phenomenal battery life. And the COROS Heart Rate Monitor is no different, with up to 38 hours of heart rate monitoring. Even the longest bike workout or ultra trail event won't let you down. In standby mode, the battery lasts up to 80 days. And you can charge the built-in battery via the magnetic charging port.
Read a detailed explanation of the technological innovations in the COROS Heart Rate Monitor and a comparison with a classic chest strap.

Why shop at the ralpu e-shop?
Goods always in stock
Only goods that are physically in stock are sold. Your order is shipped immediately. The package is usually delivered within 1 - 2 business days. No tricks.
Satisfaction guaranteed
The product comes with a 24-month warranty. If you have any questions, you can expect a prompt and helpful response. Instructions for COROS GPS watches are translated into Slovak.
Authorized dealer
The ralpu e-shop is an authorized and largest retailer of the COROS brand in Slovakia with many years of experience and appreciated by thousands of customers. You can rely on it.

Bluetooth
Up to three connections simultaneously
The modern and forward-looking Bluetooth wireless protocol allows you to connect up to three devices at the same time. And of course, it is not necessary to use strictly a COROS GPS watch. Connect to a bike computer, trainer, other watches or an app on your phone. Reliable and high data throughput. And you can be up to an incredible 120 meters away from the device. All this thanks to the modern Bluetooth protocol.
Connect to up to three devices simultaneously. Connect to a bike computer, trainer, other watches or an app on your phone. Up to three external devices simultaneously.
Range and freedom. Thanks to the modern Bluetooth protocol, you can be up to 120 meters away from the device and the COROS Heart Rate Monitor will still send heart rate data.
Technology and innovation
Practical tips
The most advanced and completely new generation of multi-channel optical sensor, offering very high signal quality. Up to 5 LEDs with 4 light detectors. All this in a miniature and smooth design, in a waterproof casing and made of materials with high scratch resistance. COROS Heart Rate Monitor has no on and off buttons, because the built-in wear detection sensor automatically recognizes when the device is on the skin of the arm.
Durable materials. With optical sensors, it is crucial that the light from the LEDs does not hit a scratch. That is why COROS has used extremely durable materials.
No buttons. The built-in wear sensor automatically detects when the device is on the skin of your arm. There's nothing to turn on or off. It just works.


Good to know
It has its limits.
The COROS Heart Rate Monitor will satisfy most sports needs, but it may have its limitations in some situations. Here are the most important limits to know before buying.
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A classic chest strap works on the principle of an ECG and responds to changes in heart rate immediately (2-3 seconds). The COROS Heart Rate Monitor uses optical sensing through the skin and responds more slowly to changes (7-10 seconds), but offers greater comfort. For most athletes, an optical sensor is sufficient - a chest strap is only needed when maximum accuracy and response speed are required. You can find a detailed comparison in this article .
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Although the COROS Heart Rate Monitor is water resistant (for example, in the rain), due to the physical limitations of Bluetooth connectivity, it does not work reliably in water – the Bluetooth signal cannot penetrate water. This means that it will not measure data accurately or consistently during water sports.
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If you have a heart condition and have been prescribed heart rate monitoring by your doctor or have other heart conditions, the COROS Heart Rate Monitor is not suitable. It is a sports device with its limitations, designed primarily for recreational sports and healthy people. For safety reasons, it is necessary to consult with your doctor before choosing the right device.
Package contents
What will be delivered to you?

Technical specification
Product parameters
Dimensions and weight | |
Physical dimensions | 42.5 x 28.4 x 9.1mm |
Weight (sensor) | 9.7 grams |
Weight (sensor + strap) | 19 grams |
Materials | |
Strap material | polyester, nylon, spandex |
Sensors | |
List | 5 LEDs with 4 light detectors | Wearing |
How to wear | on the biceps |
Biceps circumference (min. and max.) | 18 - 32 cm |
Connectivity | |
Wireless connection (protocol) | Bluetooth |
Supported external devices | Bluetooth protocol support and the ability to receive heart rate data are essential |
Number of simultaneous connections to external devices | 3 connections simultaneously |
Battery life | |
During activity when measuring heart rate | 38 hours |
Standby mode | 80 days |
Battery capacity | 55mAh |
Charging time | less than 2 hours |
Charging cable | USB-A (input) and specific magnetic connector (output) |
Resistance | |
Water resistance | 3 ATM |
Operating temperature | -20°C to +50°C |
AI-optimized Markdown version for COROS Heart Rate Monitor
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