Feature:1. Accurate Heart Rate Monitoring: Adopts optical heart rate technology to provide accurate heart rate and calorie burn data, and achieve a monitoring error of 1BPM. It supports continuously measuring real-time heart rate data during exercise.2. Broad Compatibility: Pairs with both ANT+ and BT devices, providing stable and smooth connectivity to most 3rd party fitness apps, gym equipment, and more. Sync the real-time heart rate data to the main device for analyzing training data.3. Comfortable to Wear: An Armband heart rate monitor is a great alternative to heart rate chest straps and wrist-based devices. With an adjustable band, allows maximum space for movement and works in countless different sports.4. Long-Lasting Battery: Our heart rate monitor is equipped with a high-capacity rechargeable lithium polymer battery. Enjoy more than 20 hours of tracking on a single charge, ensuring you stay on the peak of your heart rate and fitness goals.5. Outstanding Durability: The construction is tough and waterproof with an IP67 rating, perfect for intense workouts. Swim, run, or train outdoors without compromising its performance. Ideal for fitness and outdoors enthusiasts.Specification:Our heart rate optical sensor transmits real-time heart rate data through BT or ANT + to heart rate receiving devices and sports & health apps - helping you to manage your workout intensity scientifically. It can monitor heart rate zones through LED lights of different colors. Soft, stretchy, and easily adjustable armbands fit everyone. Quick and easy to put on/remove. Fits snugly, not tight, so doesn't restrict movement or breathing. Sweatproof and water resistant can help you do all kinds of sports or daily use freely, such as fitness, riding, running, exercising, yoga, and more, but not swimming.Features:Accurate Heart Rate Monitoring: Adopts optical heart rate technology to provide accurate heart rate and calorie burn data, and achieve a monitoring error of ±1BPM. It supports continuously measuring real-time heart rate data during exercise.Broad Compatibility: Pairs with both ANT+ and BT devices, providing stable and smooth connectivity to most 3rd party fitness apps, gym equipment, and more. Sync the real-time heart rate data to the main device for analyzing training data.Comfortable to Wear: An Armband heart rate monitor is a great alternative to heart rate chest straps and wrist-based devices. With an adjustable band, allows maximum space for movement and works in countless different sports.Long-Lasting Battery: Our heart rate monitor is equipped with a high-capacity rechargeable lithium polymer battery. Enjoy more than 20 hours of tracking on a single charge, ensuring you stay on the peak of your heart rate and fitness goals.Outstanding Durability: The construction is tough and waterproof with an IP67 rating, perfect for intense workouts. Swim, run, or train outdoors without compromising its performance. Ideal for fitness and outdoors enthusiasts.Specifications:Type: 1: HW9, 2: HW706 (Optional)Material: ABSColor: BlackBattery: 90mAhHW706Item Size: 1.677 * 1.149 * 0.49in/4.26 * 2.92 * 1.24cmPackage Size: 12 * 8 * 2.4cm/4.72 * 3.15 * 0.94inPackage Weight: 59g/2.08ozPacking List:1*Monitor1*Armband1*USB Cable1*User ManualPackage List:1*Monitor1*Armband1*USB Cable1*User Manual