2.USB plug-in charging design, remove the wristband and plug it directly into the USB or charging head interface, easy and convenient, plug and play 3. Built-in optical sensor, pay attention to your heart rate changes 24 hours a day, outline heart rate, present your health and beauty 4. Multi-sport mode, running, skipping, sit-ups, etc. 5. Looking for mobile phone features

6.IP67 waterproof