Crystal shell material smart watch, heart rate monitoring, sleep tracking, blood oxygen detection, call reminder, message reminder, a variety of sports modes, comfortable silicone strap, unique appearance, cool lighting, long standby time can reach 30 days,Crystal shell material smart watch, heart rate monitoring, sleep tracking, blood oxygen detection, call reminder, message reminder, a variety of sports modes, comfortable silicone strap, unique appearance, cool lighting, long standby time can reach 30 days,