Smart Watch, Smart Bracelet, Smart Ring manufacturer / supplier in China, offering R11-D Darings Provide Sdk Health Sports Monitoring Phone Ring Smart Ring, Sr08 Electronic Touch Screen Button Cotrol Digital Screen Waterproof Health Care Monitor Bluetooth Heart Rate Blood Oxygen Jring APP Smart Ring, Voice Assistant Play Music Wireless Bluetooth Call Step Distance Counting Take Photos Smartglass Smartglasses Smart Glasses and so on.