Basic models: simple design, practical functions, usb direct connection heating. Smart enjoyment: four kinds of temperature control four timing, imported heating materials, fabric comfort. Shu enjoy models: imported heating materials, three-speed temperature adjustment plus half-hour automatic timing function, magnetic buckle connection, easy to use, 3D design, comfortable eye protection. Jane luxury: “zero pressure” surround wear, effective noise reduction 30%, imported heating materials, three-speed temperature adjustment plus half-hour automatic timing function, magnetic buckle connection, easy to use, 3D design.