4K HD output, easily enjoy large screen display. Supports 1080P HD decoding 3D videos. Worked with Xiaomi air notebook, can extend 1 x HDMI port and 2 x USB ports, let more external devices can connect with Xiaomi notebook. Compatible with projector, U disk, hard disk, mouse and other USB devices for business. Made of high-quality material, let it have strong oxidation resistance and stable signal transmission. PET cable, soft, smooth and durable. USB 3.1 interface let it have 5Gbps fast-speed transmission, 50 songs per second. Intelligent recognition of devices' voltage and current, realizes 5-20V, 0A-3.5A multi-level auto switch, and supports USB-C PD2.0 protocol. Supported power supplying is up to 70W max. Mini size, can put in pocket, portable.