Chest Strap Accuracy. Arm Band Comfort.

Your watch is only as good as the data it receives. The COROS Heart Rate Monitor delivers exceptionally accurate heart rate tracking in a lightweight, comfortable arm band that lets you train harder without the discomfort of a traditional chest strap. Designed to sit securely on your upper arm, it captures reliable heart rate data during everything from easy recovery runs to race-day efforts.

Compatible with COROS watches and virtually any Bluetooth-enabled fitness watch, bike computer, treadmill, or training app, this is one of the easiest upgrades you can make to improve your training accuracy.

WHY YOU'LL ACTUALLY LOVE IT

• Chest strap accuracy—without the chest strap – The multi-channel optical sensor measures heart rate from your upper arm, where blood flow is more consistent than the wrist for highly accurate readings.
• Forget you're wearing it – The soft, low-profile fabric band stays comfortable through long runs, rides, gym sessions, and races without rubbing or bouncing.
• Built for long training days – Get up to 38 hours of continuous training or 80 days of standby on a single charge.
• Automatically ready to go – Built-in wear detection powers the sensor on when you put it on and connects automatically to your paired devices. No buttons. No menus. No hassle.
• Connect up to three devices at once – Pair simultaneously with your GPS watch, bike computer, indoor trainer, or fitness app using Bluetooth.
• Easy to clean – Remove the sensor from the washable fabric band after your workout and you're ready for tomorrow's session.
• Perfect for endurance athletes – Reliable heart rate data means better pacing, smarter recovery, and more effective training zones.

WHO IT'S FOR

• Runners training by heart rate instead of pace alone.
• Cyclists, triathletes, and endurance athletes looking for more accurate data.
• Athletes who dislike the feel of traditional chest straps.
• Anyone who wants reliable heart rate tracking without sacrificing comfort.

HOW TO USE IT

1. Slide the monitor snugly around your upper arm, between your bicep and shoulder.
2. Start your workout—the monitor automatically powers on and connects to your paired device.
3. Train with confidence knowing your heart rate data is accurate from the first mile to the last.

Pro Tip: Wear the sensor snug against the outside of your upper arm for the most consistent readings, especially during trail runs or rides with lots of vibration.

IMPORTANT: This product takes up to 2 weeks to deliver.