The alternative to a chest strap that delivers accurate heart rate data.

Your wrist-based heart rate monitor is convenient, but it's not always reliable. Spotty readings during intervals, lag during rapid heart rate changes, and completely unreliable data during strength training—sound familiar? The COROS Heart Rate Monitor solves every one of these frustrations by tracking your pulse directly from your bicep, delivering the most accurate heart rate data you've ever had.

Arm-Based Precision In Every Beat

At just 9.7g for the sensor alone, this comfortable armband transforms any Bluetooth-compatible device into a precision heart rate system that responds instantly to changes, works flawlessly during any activity, and provides insights wrist monitors simply can't match.

Why arm-based heart rate tracking is better:

Zero wrist interference - No more gaps from wrist movement or sweat
Strength training accuracy - Reliable readings during weights and hybrid workouts
Instant response - Advanced optical sensors capture heart rate changes instantly
Multi-device connectivity - Connect to 3 devices simultaneously for complete training ecosystem

Highlights of COROS Heart Rate Monitor:

Precision Optical Technology: 5 LED lights with 4 photodetectors deliver clinical-grade accuracy that responds instantly to heart rate changes, even during the most demanding workouts.

Armband Comfort Revolution: Forget uncomfortable chest straps. The soft polyester-nylon-spandex blend sits comfortably on your bicep (fits 7.09-12.6 inches) without restricting movement or breathing.

Multi-Device Mastery: Connect simultaneously to your COROS watch, phone, and gym equipment. Switch between devices seamlessly without re-pairing or losing connection.

All-Activity Reliability: Whether you're running intervals, lifting heavy, or doing yoga, get consistent, accurate heart rate data that wrist monitors can't deliver.

Extended Battery Life: 38 hours of continuous tracking means it outlasts even your longest training blocks. 80-day standby time and less than 2 hours charging keep you ready for anything.

Weather-Proof Performance: 3 ATM water resistance and operational range from -4°F to 122°F (-20°C to 50°C) means this monitor works in any conditions your training demands.

Ultra-Lightweight Design: At 9.7g for the sensor (19g total with band), you'll forget it's there while getting more accurate data than ever.

Universal Compatibility: Works with any Bluetooth-compatible device that receives heart rate data—COROS watches, smartphones, bike computers, treadmills, and more.

Complete Package Includes:

COROS Heart Rate Monitor sensor
Comfortable armband (fits 7.09-12.6 inch arms)
Magnetic USB Type-A charging cable
Quick start guide

Wear on your bicep for optimal comfort and accuracy—the advanced optical sensors automatically adjust for your skin tone and positioning.

Works with all Bluetooth-compatible devices including COROS watches, smartphones, fitness apps, and gym equipment. Connects seamlessly with simultaneous 3-device pairing and real-time heart rate data sync.

Sizing:

Standard 7.09-12.6 inches (18-32cm)

Large 9.4-16.9 inches (24-43cm)

APEX 4

Coros Nomad

Pace 4

Coros Heart Rate Monitor