COROS Heart Rate Monitor
COROS Heart Rate Monitor
In essence. One of the brand's most popular products. Highly rated by customers for comfort, reliability, and ease of use. A full replacement for traditional chest straps, excellent battery life, and compatibility not only with COROS watches.
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The standard strap fits an arm/bicep circumference of 18 — 32 cm and works for most users.
The Large version covers 24 — 43 cm, designed for users with a bigger bicep.
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COROS Heart Rate Monitor - Accurate heart rate, all day
Precise measurement and total comfort
Pairs with any Bluetooth heart rate-enabled device — and connects to up to three at the same time. Up to 38 hours of continuous heart rate tracking on a single charge. Stays put without slipping, without chafing, without fuss. No buttons. It knows when it's on your arm and starts measuring automatically.
COROS Heart Rate Monitor - Comfort
Built for everyone, including women
Chest straps are accurate, but wearing one is rarely comfortable. They slip during longer efforts, rub against skin and sit awkwardly with a sports bra. COROS Heart Rate Monitor is worn on the upper arm — it stays in place through long sessions, doesn't restrict movement and doesn't catch on clothing. Soft fabric, a precise velcro fit and a smooth low-profile design.
Unisex design. Comfortable arm placement, soft fabric and a secure fit. Particularly useful for women for whom chest straps are an issue — it simply stays out of the way.
Why the arm? The upper arm has a high density of muscle tissue and a rich network of blood vessels close to the surface — both of which contribute to more accurate optical readings compared to the wrist.
COROS Heart Rate Monitor - Battery life
38 hours of tracking
COROS watches are well known for exceptional battery life — and the Heart Rate Monitor follows the same logic. 38 hours of continuous HR tracking means it outlasts even the longest bike sessions or ultra-distance events without needing a charge. In standby it stretches to 80 days. Charging the built-in battery is handled through a magnetic charging port.
COROS Heart Rate Monitor - What's new in COROS Heart Rate Monitor
Read a detailed breakdown of the technology behind the COROS Heart Rate Monitor and how it compares to a traditional chest strap.
COROS Heart Rate Monitor - Bluetooth
Three connections at once
The modern Bluetooth protocol supports up to three simultaneous connections — and it doesn't have to be a COROS watch on the other end. Pair it with a bike computer, a smart trainer, a different GPS watch or a phone app. Reliable data transmission throughout, with a wireless range of up to 120 metres.
Three devices at once. Connect to your bike computer, smart trainer, watch and phone app simultaneously — any combination of up to three Bluetooth-enabled devices.
120-metre range. The modern Bluetooth protocol keeps the connection solid even when you're well away from your devices — up to 120 metres of reliable transmission.
COROS Heart Rate Monitor - Technology
Details that matter
The latest generation multi-channel optical sensor delivers high signal quality — 5 LEDs paired with 4 light detectors in a compact, smooth housing. Water-resistant casing and scratch-resistant materials throughout. There are no buttons: an integrated wear-detection sensor recognises when the device is against your skin and starts measuring automatically.
Scratch-resistant materials. For optical sensors, a scratched lens directly affects measurement quality. COROS used highly scratch-resistant materials to keep the sensor window clean and accurate over time.
No buttons. The integrated wear-detection sensor knows when the device is on your skin and starts measuring automatically. Nothing to switch on or off. It just works.
COROS Heart Rate Monitor - Worth knowing
It has limits
COROS Heart Rate Monitor covers the needs of most athletes in most situations — but there are some limitations worth knowing before you buy.
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A traditional chest strap uses ECG-based sensing and responds to heart rate changes almost instantly (2–3 seconds). COROS Heart Rate Monitor uses optical sensing through the skin and has a slightly slower response time (7–10 seconds) — but for most sports and training scenarios, that's perfectly adequate. A chest strap is only necessary if you need the fastest possible response and maximum precision. You can read a detailed comparison in this article.
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The device is water-resistant and handles rain without issues, but Bluetooth signals can't penetrate water — so in-water sports will give unreliable or inconsistent data. It's not designed for swimming or other water-based activities.
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If you have a heart condition and your doctor has prescribed heart rate monitoring for medical reasons, this is not the right device. COROS Heart Rate Monitor is a sports accessory designed for healthy recreational athletes. For medically indicated monitoring, consult your healthcare provider about the appropriate device.
What's in the box
COROS Heart Rate Monitor package contents
COROS Heart Rate Monitor specifications
Technical details
| Dimensions and weight | |
| Dimensions | 42.5 × 28.4 × 9.1 mm |
| Weight (sensor only) | 9.7 g |
| Weight (sensor + strap) | 19 g |
| Materials | |
| Strap material | polyester, nylon, spandex |
| Sensors | |
| Optical sensor | 5 LEDs with 4 light detectors |
| Wearing | |
| Placement | upper arm (bicep) |
| Arm circumference (min–max) | 18–32 cm |
| Connectivity | |
| Wireless protocol | Bluetooth |
| Compatible devices | Any Bluetooth device capable of receiving heart rate data |
| Simultaneous connections | up to 3 |
| Battery | |
| Active HR tracking | 38 hours |
| Standby | 80 days |
| Battery capacity | 55 mAh |
| Charging time | under 2 hours |
| Charging cable | USB-A (input) with proprietary magnetic connector (output) |
| Durability | |
| Water resistance | 3 ATM |
| Operating temperature | −20 °C to +50 °C |
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