CABLEDECONN DisplayPort HDMI Splitter 8K MST SST 1In 2Out Directional DP 1.4 8K@30Hz 4K@120Hz to DisplayPort HDMI 8K 2.1 1440P@165Hz Directional Converter Switch Multi Screen Transfer

This worked perfectly first time, you need to read the instructions in the product description.This must be powered via the USB micro cable supplied, i plugged it into the USB on my monitor/tv, also you need the right HDMI and DP cables to get max resolution. HDMI 2.1 and DP 1.4/both cables should support 8K.If you dont power the box you will see nothing and if you don't have the right cables you will be unable to get the highest resolutions, also if your screens can't do a resolution or frame rate they will not work either.I have a 1080p monitor at 144hz and a 4k TV at 60hz (both at their highest frame rates), i can have both running or switch one or the other off within windows. I wish this device had an onboard switch to turn off signal to each monitor.The construction is solid, all metal. Wish it also was USB C for the power port but at least a USB Micro cable was included.

It s a really good product for the price, but because of the description it's not exactly clear what it does:1- It an extender which is good but you have to manually mirror the screen from windows which can result in other problems in my case.2-It can only do 125Hz through DP at 1440.3-It doesn't work with Freesync in my case (Probably not with G-Sync as well)4-It may need more power from the USB as when I had it powered only by PC and would make my screen flicker constantly so I moved it into a Powerd USB.Overall crazy good for the price, screen extenders are not exactly cheap, but if only had the description right.