COROS Heart Rate Monitor – Arm Band HRM with Bluetooth & 38-Hour Battery

The COROS Heart Rate Monitor is an arm-worn optical heart rate monitor that delivers chest-strap-level accuracy without the discomfort of a chest strap. Available in Grey, Lime, and Orange, it pairs via Bluetooth with any compatible device — COROS watches, Garmin devices, Wahoo computers, indoor trainers, and any other Bluetooth heart rate-enabled device — and can connect to up to three devices simultaneously. It's the practical choice for athletes who want accurate, comfortable heart rate data across all their training platforms without managing multiple sensors.

The multi-channel optical sensor measures blood flow at the arm, capturing heart rate data with high signal quality and accuracy comparable to a chest strap. The sensor is housed in a durable, scratch-resistant casing and sits within a soft fabric band with an adjustable elastic and velcro closure — low-profile, snug, and comfortable for even the most intense sessions. Automatic wear detection powers the device on when you put it on and off when you remove it, preserving battery life. The battery delivers over 38 hours of continuous use and up to 80 days of standby, making it suitable for multi-day training blocks without daily charging. The sensor is removable for easy band cleaning — replacement bands are available separately in matching colours as the COROS Heart Rate Monitor Band.

Browse the full Coros range or our computers and GPS collection for compatible devices including Garmin computers and watches.

What It's Good For

• Accurate arm-worn heart rate monitoring — multi-channel optical sensor with chest-strap-level accuracy
• Connects to up to 3 Bluetooth devices simultaneously — COROS, Garmin, Wahoo, indoor trainers, and any BT HRM-compatible device
• Over 38 hours continuous battery life — up to 80 days standby
• Automatic wear detection — powers on and pairs when worn, powers off when removed
• Soft fabric band with adjustable elastic and velcro closure — comfortable for intense sessions
• Removable sensor for easy band cleaning; replacement bands available as the COROS HRM Band
• Available in Grey, Lime, and Orange

What It's NOT Good For

• Athletes who specifically require a chest strap — some sports (e.g. swimming) or specific devices may require a chest strap HRM
• Wrist-based heart rate monitoring — this is an arm band device, not a wrist-worn sensor
• Devices without Bluetooth heart rate support — check your device's compatibility before purchasing
• GPS tracking or multi-sport data beyond heart rate — this is a dedicated HRM only

Frequently Asked Questions

Is it compatible with non-COROS devices?
Yes — the COROS Heart Rate Monitor connects via standard Bluetooth to any Bluetooth heart rate-enabled device, including Garmin watches and Edge computers, Wahoo head units, Zwift, indoor trainers, and third-party fitness apps. It can connect to up to three devices simultaneously, so you can broadcast to your watch, cycling computer, and training app at the same time.

How accurate is arm-based heart rate monitoring compared to a chest strap?
The COROS HRM uses a multi-channel optical sensor positioned on the upper arm, where blood flow signals are stronger and more consistent than at the wrist. In most training scenarios, arm-based optical HRM accuracy is comparable to a chest strap. For very high-intensity interval training with rapid heart rate changes, a chest strap may respond marginally faster, but for the vast majority of training the COROS HRM delivers reliable, accurate data.

How long does the battery last?
The COROS Heart Rate Monitor provides over 38 hours of continuous use on a single charge, with up to 80 days of standby time. Automatic wear detection helps preserve battery by powering the device off when not worn.

Can I replace the band?
Yes — the sensor pod is removable from the band, allowing you to wash the band separately or replace it entirely. Replacement bands are available in matching Grey, Lime, and Orange as the COROS Heart Rate Monitor Band.