Product Price Heart Rate Accuracy (%) Battery Life (hours) Water Resistance (meter) Screen Size (inches) GPS Accuracy (meters) Compatibility
COROS COROS heart rate monitor
US
£59.91 38 hours 3 ATM Compatible with any Bluetooth heart rate-enabled device; up to 3 simultaneous Bluetooth connections

COROS heart rate monitor is an arm-mounted optical HR monitor designed to be simpler and more comfortable than a chest strap. It pairs over Bluetooth and supports up to 3 simultaneous device connections, with wear detection for automatic pairing when you start workouts. It runs up to 38 hours on a charge and is water resistant up to 3 ATM.

★ Ideal for

Its soft, low-profile arm band is designed for comfort and secure placement, and it delivers up to 38 hours of continuous monitoring with up to 3 simultaneous Bluetooth connections during workouts.

Garmin Forerunner 965 (MPN 010-02809-10)
US
£174.38 Up to 23 days 5 ATM 1.4 in ± 2 m under ideal conditions iOS and Android with Garmin Connect app

Garmin Forerunner 965 is a premium multisport GPS smartwatch with an AMOLED touchscreen, built-in full-color mapping, and multi-band GPS (GPS, Galileo, GLONASS). It's designed for serious runners and triathletes who want detailed training insights plus long endurance battery life for training and race days.

★ Ideal for

Its wrist-based heart rate sensor and long GPS battery life (up to 31 hr) make it a comfortable workout companion for extended runs and triathlon sessions, with an AMOLED 1.4 in display and 5 ATM water rating for all-weather use.