ELUTENG USB C to HDMI, USB Type C to HDMI Adapter (Thunderbolt 3 Compatible) 4K 60Hz Support Audio and Video Transmission Type C 3.1 to HDMI Coupler Female to Male for USB-C Devices | Uni-Directional USBC/Thunderbolt 3 to HDMI 2.0 Adapter 4K@60Hz Source to Display Connector

does not work also amazon lost this item when I returned it; I got no refund just horrible (nonexistent) customer service

These didn't work for me. I need a more expensive device to change usb protocol into hdmi protocol. It's not as simple as adapting the connectors.

Here's my use case: I'm traveling and I want to play videos from my iPad Pro on the hotel television. The easy way to do this would be to plug a USB-C to HDMI adapter into my iPad and run an HDMI cable from my iPad to the hotel television. The problem? This set up means that I have to bring an HDMI cable with me. I don't want to do this. I'm already bringing several USB-C cables. I want to use one of those those. So I need an adapter that plugs into my hotel television that allows me to use a USB-C cable instead of an HDMI cable. This adapter does this, and it does it reliably. Two other products I tested completely failed. (Elebase and ULT-WIIQ) The ELUTENG is the only one I've tried that actually worked. Also, VERY IMPORTANT: These products are directional. That means that the signal is only designed to go one way. This one transmits a signal from a USB-C output/source to an HDMI input. You can also get versions that take an HDMI output and convert it for a USB-C input. If you order an adapter that is designed to work in the opposite direction of what you need, it will not work for you.

I figured with this supporting thunderbolt, it would support the full range of HDMI features, but unfortunately it doesn't support DDC over HDMI where I could control my monitor's brightness, color controls, contrast, etc. Oh well, the hunt continues for an adapter that will work

The USB to HDMI dongle works very well. Was surprised that none of my six USB cables worked. But as the product listing shows you need to make sure you have a USB 3.1 or higher USB cable. Which I had to go out and buy. Once I use the proper USB cable it works great and it is extremely portable.