Features: 1.Usb 3.0-5gbps ultra-high-speed transmission, 1 usb 3.0, 1 type c 3.1 and 1 4k hdmi female expansion port, meet the transmission, charger requirement. 2. Could connect with plenty of usb and charging to MacBook. 3. Type-c upper and lower end interface is exactly the same, dont have to distinguish the usb data interface between positive and negative. You can plug in both directions. 4. Transmits high-definition audio and video from computer or tablet to hdmi display for streaming and gaming with resolution up to full aperture 4k(4096×2160) / 2160p (4k) ultra hd. Also, supports 1080p, 720p, 480p and other. *Compatible with hdmi 1.4 and former versions as well as hdmi audio. 5. Support device: MacBook (usb type-c) os x system, Chromebook pixel. 6. Note: Please plug in again if product appears unstable. Package include: 1x type-c charging hub how to connect: 1. Step 1: Connect usb type-c connector of the adapter to any usb type-c hdmi mode supported devices. 2. Step 2: Connect hdmi output of the cable to hdtv or hdmi enabled display using standard hdmi media cable. This adapter does not work with phones as the output. Only for computers with type-c connections.