smart wristband sport waterproof bracelet heart rate blood pressure blood oxygen health monitoring motion tracking data record child adult

product description: 1. this product is our company's independent research and development, owning the world only property rights 2. this product conforms to ce, fcc, rosh and other international certifications 3. this product supports english, and supports multi-national languages in connection with mobile app, with more complete functions 3. hand ring data can be stored for 7 days and stored in app for a long time 4. this product focuses on samrt healthy life, specializing in smart life design