At present, the mainstream mobile phone brands in Europe and the United States are mainly Apple, Samsung, Nokia, Huawei, MOTO, LG, HTC, BlackBerry and other 15 brands. Except for Apple, other brands have switched and adopted the USB-C interface uniformly. The reason that most manufacturers willing to switch to the USB-C interface is because of its many advantages. One is that it solves the problem of both positive and negative plugs. On the other hand, the USB-C interface can achieve faster charging and fast transmission, it can provide a higher current charging of up to 100W, achieving the fastest transmission speed of 10Gbits / s, besides providing audio transmission. In addition, it has a lower degree of damage to the resolution. Then USB C interface has strong scalability, not only preserve charging and data transmission functions, but also support audio and video transmission functions USB-C interface able to transmit audio and video signals to a variety of audio and video output interfaces, including HDMI, DVI, VGA interfaces. Moreover it can achieve the expansion of 4K resolution, which enable USB-C a wide range of applications, such as PC / tablets, TVs, wearables, automotive, home and other fields.