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, don't 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 Inclued: 
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 USB C adapter does not compatible with Smartphones with USB C port

Devices the Type-C output compatible with: 
The newest 2016 MacBook Pro; 
2015, 2016 MacBook 12''; 
Chromebook Pixel; 
Dell XPS 13-9350-R1609 13.3''; 
Dell XPS 15; 
HP EliteBook Folio G1; 
HP Spectre; 
Lenovo Air 13 Pro; 
Lenovo Air 12; 
Lenovo YOGA 5 Pro; 
Lenovo Air 12; 
Lenovo YOGA 900; 
Acer V15 Nitro; 
Samsung Notebook 9 900X5L-K01; 
HuaWei MateBook