Product Price Heart Rate Accuracy (%) Waterproof Rating (IPX) Battery Life (hours) Compatibility Chest Strap Material Monitoring Range (beats per minute (bpm))
COOSPO H9Z Rechargeable Heart Rate Monitor Chest Strap (H9Z X1)
US
£32.39 +1 bpm IP67 50 hours Bluetooth and ANT+

COOSPO H9Z is a rechargeable chest-strap heart rate monitor that uses Bluetooth 5.0 and ANT+ for connecting to devices and apps. It's rated IP67 for water resistance and is designed for workout heart rate zone tracking with a 5-color LED. The rechargeable battery is rated for 50 hours per charge.

★ Ideal for

For extended use, it has 50 hours battery life per charge and rechargeable 70 mAh lithium battery, avoiding battery changes during long training periods.

Fourth Frontier Frontier X2
US
£427.24 pinprick accurate IP67 14 days typical use Apple Health, Google Fit, Strava, TrainingPeaks, Zwift, Wahoo, Garmin and Bluetooth 5.0 devices elastic

The Frontier X2 is a lightweight chest-worn monitor that records continuous ECG, heart rate, HRV, breathing rate, strain and movement metrics. It suits athletes, data-focused users and people who want long-duration heart monitoring with app integrations and real-time vibration alerts.

★ Ideal for

It suits extended use through its lightweight 25 g design, soft adjustable elastic strap and typical battery life of 14 days, although continuous ECG recording lasts up to 24 hours.