Information: HW807 is a heart rate armband designed for professional trainers who need efficient, concrete, scientific training. Combining with Heart Rate Zone(HRZ), HW807 will help you get better performance on training Heart Rate Zone Training HW807 equips with a 5-color LED indicator light for Heart Rate Zone Training. You can check your real-time heart rate zone by LED color instead of checking your smartphone. Bluetooth and ANT+ Technology Via Bluetooth and ANT+ transmission, HW807 can send real-time heart rate data to smart devices like smartphones, fitness equipment, bike computers. It is compatible with popular fitness apps, for example, CoospoRide, Wahoo, Zwift, Rouvy, Trainerroad Accurate Heart Rate Tracking HW807 integrates with the latest optical sensor array and our self-developed algorithm, which can provide precise real-time heart rate data while you are running, cycling, or doing other aerobic exercises Convenient and Comfortable Equipped with sweat proof designed strap, HW807 can be comfortably and conveniently to fit around your arm during any strenuous exercise Heart Rate Alert Thanks to the hardware support, HW807 has a vibrating motor for notifications. It will alert you once your heart rate is exceeding 180bpm Magnetic USB Charging Using a Rechargeable lithium battery (90 mAh), HW807 can last up to 20 hours of workout after each charging IP67 Waterproof Coming with IP67 rating, you can ride without fear of rain Specification: - Body dimensions (LxWxH): 43.00*36.00*12.50mm - Weight: 19g - Battery: Rechargeable lithium battery 90 mAh - Battery life: 20 hours - Wireless connections: Bluetooth 5.0, ANT+ - HRV: Yes - LED indicator: Yes - Charging method: Magnetic USB Charging - Operating temperature: -10℃~ 50℃