works great after you set it up properly. there are a couple of items that are not explained or fully disclosed as to what you will need to connect to your pc/laptops. for each laptop or pc you will need an hdmi/usb cable which is provided in the kit to run from your pc/laptop taking up one hdmi and one usb port on your pc/laptop to the usb and hdmi -monitor port on the kvm switch (either a/b/c depending on which monitor you want which pc/laptop to display on). this only allows you to display up to three pcs or laptops on one of the three monitors (one pc/laptop of the four pc/laptops possible to be connected to the kvm switch to display on one of the three monitors). if you want to display each of the pc/laptops across all three monitors at once - you will need to two additional hdmi-hdmi cables per pc/laptop and two additional hdmi ports on each pc/laptop. here are the problems: one this is not made clear in the product descriptions to know this before purchase, two: there are not enough hdmi-hdmi cables provided to connect all possible four pc/laptops. there are enough for connection of three pc/laptops with one extra hdmi-hdmi cable, to hook-up four pc/laptops you will need to purchase at least one additional hdmi-hdmi cable, and three: you need to look at your pc/laptops carefully. most will not have three hdmi ports and a usb port. the normal standard for laptops is two usb, one hdmi, and one usb-c. to make this work you will therefore need a usb or usb-c docking station for each pc/laptop that does not have enough hdmi ports. in my configuration of three laptops connected to three monitors in which i wanted to display each of the laptops across all of the three monitors one laptop at a time - i needed to purchase three usb-c hubs with each usb-c hub having at least two hdmi ports. i connected each usb-c hub to each of the individual laptops via a usb-c port and then connected the two additional hdmi-hdmi cables into the usb-c hdmi ports and then to the kvm switch input ports for each pc/laptop connections for the two monitors not connected by the previous hdmi-usb cable. this was an expense that was not clearly identified in the purchase advertisement literature or even explained well in the product user-manual. i had to go out to the web and find third party videos and articles on the set-up before this became clear.

spent half the day, rearranging my setup, so i can make this work for me... used the cables that came with, and unit... usb wise worked fine for me... but no display connected was ever found by any pc connected.... i tried different configurations with no result... not worth the money if doesnt do the one thing it needs to do.