Features: 1. Convenient charging: The watch adopts a quick-release and separate wristband design, and it can be charged by plugging in a USB port. It is a cumbersome charging cable. 2. Heart rate monitoring: The bracelet uses Silicon labs: a new generation of sensors from the United States, combined with the sixth-generation health power monitoring technology developed based on the heart rate big data of millions of people, combined with the intelligent heart rate algorithm, and the measurement is more accurate. 3. Comfort: The watch adopts ergonomic design and classic hole-style wrist buckle design, suitable for all kinds of wrists. The new upgrade is soft and comfortable, tough and wear-resistant, sweat-proof and breathable, and multi-color straps can be matched. 4. Brightness adjustment: The watch has 4 levels of brightness adjustment, no fear of sunlight and night, no eye damage, intelligent brightness adjustment. 5. Sleep analysis: The watch has transparent sleep data, which can improve your sleep quality, automatically track and analyze your sleep data, and set a silent vibrating alarm clock. Description: This smart phone has a stylish and beautiful appearance, large memory capacity, the phone is very smooth, the camera is very clear, and it has a variety of multimedia functions that will bring convenience to your life. Specifications: Battery type: Lithium polymer battery Battery capacity: 90mAh Input voltage: 5.0V Bracelet full length: 240mm full length Waterproof rating: IP67 Wrist buckle material: aluminum alloy System requirements support: for Android44 or for iOS8.0 and above devices Package Included: 1 pc * Watch(Li battery included) Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.