Introducing the NNEOBA Fitness Heart Rate Sensor Armband, your ultimate companion for cycling and workouts Product Features: Precision Monitoring: The heart rate armband utilizes advanced optical heart rate technology to deliver accurate heart rate and calorie burn data with a minimal monitoring error of just 1BPM. Heart Rate Zone Monitoring: Stay on top of your training with the HW9's 5-color LED indicator lights, making Heart Rate Zone Training a breeze. Optimize your intensity levels effortlessly, and track your heart rate variability (HRV) for deeper insights into your fitness. Comfortable Design: Say goodbye to uncomfortable chest straps and bulky wrist devices. The HW9 armband offers maximum freedom of movement, thanks to its soft, breathable, and adjustable band. Enjoy unparalleled comfort during all your training sessions. Seamless Connectivity: With Bluetooth 5.0 and ANT+ technology, the Armband easily connects to GPS bike computers, fitness apps, running watches, and more. Experience the convenience of dual Bluetooth connections for enhanced compatibility. Customizable Max Heart Rate: Personalize your training experience by setting your maximum heart rate value through the Heartool or Coosporide App. Ensure you're always training in the optimal zone for maximum results. Heart Rate Vibration Alerts: Stay safe during your workouts with vibration alerts. Receive warnings when your heart rate exceeds the preset maximum value, keeping you informed and in control of your training. Long-lasting Battery: Enjoy up to 35 hours of continuous use on a single charge, with fast-charging capabilities and a convenient magnetic charger included. Extend battery life by using a DC 5V power adapter or computer USB port for charging. Recommended Apps: Compatible with over 200 apps including Wahoo Fitness, Strava, Polar Beat, DDP Yoga, HR monitor, CooSporide, Elite HRV, and Zwift, the COOSPO Bluetooth 5.0 heart rate armband ensures seamless integration with your favorite fitness platforms.