COROS HRM-JAK hartslagarmband (Jakob Ingebrigtsen Edition)

The COROS HRM-JAK is an advanced optical heart rate monitor worn on the upper arm or forearm, delivering precise real-time heart rate data without a chest strap. Developed in collaboration with elite middle-distance runner Jakob Ingebrigtsen, it combines a five-LED, four-photodiode sensor with a soft textile strap for accurate, comfortable performance during the toughest workouts.

Advantages

The HRM-JAK features a five-LED, four-photodiode optical sensor that captures heart rate with remarkable accuracy, even during high-intensity intervals. Its soft, breathable textile strap adjusts to fit arm circumferences between 18 and 32 centimetres, providing a secure yet comfortable fit for most users. With up to 38 hours of continuous operation on a single charge, this sensor will easily accompany you through multiple training sessions and long races. The built-in rechargeable lithium-ion battery charges via a convenient USB-C port, and a full charge takes less than two hours.

Suitable for

• Endurance runners and triathletes who need reliable heart rate data over long periods
• Cyclists wanting a comfortable armband that works with their existing sports watch or bike computer
• Fitness enthusiasts looking to upgrade from a chest strap to an optical sensor

Key specifications

• Optical heart rate sensor with 5 LEDs and 4 photodiodes
• Bluetooth 5.0 and ANT+ wireless connectivity
• Up to 38 hours of battery life
• USB-C charging, full charge in under 2 hours
• Water resistant to 3 ATM (30 meters)
• Adjustable strap fits 18-32 cm arm circumference
• Compatible with COROS watches and third-party devices

Recommendations

For athletes seeking a chest-strap-free heart rate solution with elite-level accuracy, the COROS HRM-JAK offers a perfect blend of comfort, connectivity, and endurance. Its collaboration with Jakob Ingebrigtsen ensures it meets the demands of world-class training.