HEART RATE MONITORINGDURING EXERCISEPPG optical sensor precisely monitor your heart rate during sport and provide high heart rate warning, making exercise more efficient and safe.MAGNETIC SPORTEAR HOOKSClip the ear hooks during workouts to enhance the firm fit and stability of the earbuds, and prevent them from dropping.SUPERIORSPORT SOUNDHi-Fi sound experience, enhanced beats during workout, ambient sound enhancement (Thru mode), and in-ear fitness notifications.IP55* WATER & DUST RESISTANTEffectively protected against damage caused by dust, rain and sweat, keeping users free from worry during workout.