These devices, that I'm guessing come in a two pack because they are small and easy to lose, are great. The only issue is "I" bought them for a reason they are not meant for and I bet others will do the same, so this review is going to address that possiblity.
For what they do, they are amazing.
I had the great idea that I could hook my MINI HDMI camera to my laptop using it. The laptop had a regular HDMI port after all. So this is where my mistake may help you to avoid a similar issue.
The HDMI port that most computers come with are output only, not input. Unless you have a fancy graphics card or a TV input device of some sort, this or any adapter will not help you achieve this task. I was going to return it and I'm sure the company would have, but they are so cheap, I decided I'm going to keep them and maybe another use will come down the road. I have every adapter known to humankind; why not have a couple of these too.