Heart rate monitoringAlways take care of your health...The built-in HRS3300 high-precision optical heart rate sensor,combined with the intelligent heart rate algorithm, can accuratelymonitor your own heart rate data at any time, deeply track theheart health level, and reduce the chance of accidental risks.Suitable for indoor and outdoor: the battery life is up to 50 hours in training mode. Color touch screen,Side operation button, innovative pulse measurement on wrist, smart calorie counter and GPS through smart phone.VerySuitable for gym, group and team sports, swimming, running, cycling, jogging.Daily personalized training device: it can be called anytime and anywhere and assembled separately after the user recovers and the day shape. TrainingThe unit provides visual instructions in real time.Buffer: analyze the * phase and provide detailed * graphics.Training load and recovery tracking tools help you optimize training and avoid overtraining. Run and ride performanceTest your performance and personalize your heart rate, speed, and power zones.Collection Report: Night charging will provide daily feedback, night pressure and training.