✅±1BPM OPTICAL HEART RATE ARMBAND & CALORIE TRACKER: COOSPO HW9 heart rate armband uses optical heart rate technology to provide accurate heart rate and calorie burn data, achieving a monitoring error of ±1BPM.

✅HEART RATE ZONE MONITORING & HRV FUNCTION: HW9 features a 5-color LED indicator light for Heart Rate Zone Training, which shows your heart rate zone at a glance, so you can optimize your intensity levels at the right time. Also supports heart rate variability (HRV) function.

✅COMFORTABLE TO WEAR: The armband heart rate monitor is a great alternative to chest straps and wrist-based devices. The HRM armband sensor allows maximum freedom of movement and works in countless different sports. HW9 comes with a soft, breathable, and adjustable band for all training and exercise.

✅CONNECTIVITY: Bluetooth 5.0 and ANT+ ensure that you can connect the COOSPO HW9 heart rate armband sensor with GPS bike computers/APP/Fitness Devices/Running Watches. You can have two simultaneous Bluetooth connections with the latest technology.

✅SUPPORT MAX HEART RATE CUSTOMIZATION: The Heartool/CooSporide App allows you to customize your true max heart rate value with the HW9, so that you reach your real heart rate zone and can optimize your intensity levels at the right time. (Default MAX heart rate is 200bpm)

✅MAX HEART RATE VIBRATION: When your heart rate is higher than your set MAX heart rate value or your customized value, the HW9 armband provides a vibration warning, ensuring your training safety.

✅RECHARGEABLE BATTERY: Provides up to 35 hours of battery life with fast charging and a magnetic charger. To extend battery life, please use a DC 5V power adapter or computer USB port for charging.

✅RECOMMENDED APP: The COOSPO Bluetooth 5.0 heart rate armband is compatible with 200+ APPs like Wahoo Fitness/Strava/Polar Beat/DDP Yoga/HR monitor/CooSporide/Elite HRV/Zwift.