CKL KVM Switch Dual Monitor HDMI 4K@60Hz (2 Monitors 4 Computers 942HUA-3) for Home and Office to Console Desktops/Laptops, Support USB 3.0, Hot Key, Audio, Wireless Keyboard and Mouse

The multiple displays work great! But, the mouse and keyboard sharing gave me trouble from the very beginning. I originally thought it was software related, something that I may or may not have installed on my PC. I continued to troubleshoot from a software perspective, for months, only to recently realize that it was this switch! When plugged into the switch, the mouse was recognized by the laptop, but every once in awhile, the mouse pointer just started jumping around the screen, or as I typed, it would open various apps, as if I've clicked on one of those apps. I experienced the Windows "Blue screen of death" many, many, many times since purchasing the switch. After writing a scathing, bad review, the manufacturer reached out to me. When I explained what had been happening, and that I was at my wits end, support mentioned that there was a "Hot Key" button on the front of the device, and asked whether it was on or off. I told them that I had never messed with this button, but that it was on. They told me that if this button was on, with certain keyboards and mice, it could cause such issues. I switched off the "Hot Key" button, and both the mouse and keyboard immediately started to work. After about 2 weeks now, with the "Hot Key" button off, I can happily say that I no longer have the "bouncing" mouse, the keyboard is now working as intended, and I have not had a single crash or blue screen of death, since turning it off. I wanted to rewrite my negative review, and turn it into a positive review. I really wish I had reached out to the manufacturer support team earlier. I could have saved a lot of hair, and my hair would probably still be a dark brown. ))) Knowing what I know now, I'm ashamed to say that it was operator error. This seems to be an excellent 4-port KVM switch.

The short story is, it works. It's finnicky and has a couple of warts. But, if you need a dual-monitor HDMI KVM and have some patience (and the right parts), you'll very likely be able to get it to work and be pleased with it. The longer story is, out of the box I had a couple of problems and came very close to returning it. The first problem was, one of my monitors was a DVI monitor. I connected it to the KVM using an HDMI-to-DVI cable (not a DVI cable with an adapter). When I switched between computers, the screen would look fine for one second and then turn to colorful static. Both the monitor and the cable worked fine without the KVM, but I tried a different cable anyway. No use, didn't work, same behavior. The second problem was, my PC has two video ports, HDMI and Display Port. The KVM detected the signal from the HDMI port fine, but not the Display Port. Again, I used a cable (HDMI to Display Port) without an adapter that worked fine without the KVM. So, I boxed it back up and requested a return label from Amazon. A couple of days later, before dropping the box off for return, I decided to try again. I bought an HDMI monitor to replace the DVI monitor and then did some research into the Display Port problem. Turns out, I needed an active Display Port adapter with an HDMI cable. The Display Port to HDMI cable I had was passive. (And if you don't know what this means, I didn't either.) A week later, with the new parts in hand, I hooked everything up and it all worked fine. Also worth mentioning, one of the computers hooked up to this is a MacBook with a USB-C to HDMI cable, which works fine, no adapter needed. As for the warts, there are two. The first is, it doesn't come with a power adapter. It comes with a USB to power plug cable, but you need your own USB charger. (I used the one that came with my Roku because that device is plugged directly into the USB port on the TV.) This is a $300 KVM. For that price it should definitely come with a power adapter. The second wart is, it needs to be power cycled about once a week. What happens is, my mouse still works fine, but my keyboard (Redragon wired keyboard) stops working (though, it still draws power and the RGB lights stay on). Luckily, the KVM has a power switch on the back. So, I just need to turn it off, count to ten, and turn it back on. (Of course, the computer thinks the monitors have been unplugged, so all the windows on all the connected computers get moved around and resized.) I'll also mention, my mouse is a wireless Logitech M570, which works perfectly when the receiver is plugged into the mouse port on the KVM. I purchased this KVM to replace an IO Gear single-monitor DVI KVM. Wireless receivers do not work in the mouse port on that KVM, so there's another plus for this one. If you do purchase this and need to attach it to Display Port, here's the adapter that worked for me: https://smile.amazon.com/gp/product/B00S0C7QO8/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Gotta love this thing. It does exactly what the write-up said it would do. I knew I would need to provide two cables and one adapter, so I ordered those along with the KVM. The set-up instructions were clear and concise. It took half an hour to unplug my two monitors, unpack the switch, identify and install 16 cables connecting 3 tower PCs (3 cables each), 1 laptop, 1 keyboard, 1 mouse, and 2 monitors. I powered up the KVM, turned it on, and it worked! I was warned that the adapter (display-port to HDMI) might not perform properly, but it did (I didn't buy a cheap one). Later, I changed out the gaming keyboard & mouse with a logitech wireless keyboard & mouse (one little dongle instead of two cables) and that worked perfectly. It's bloody rare these days that a product actually does everything the manufacturer claims, but CKL's KVM does exactly what it's supposed to, and you don't have to be Macgyver to make it work. Full disclosure: setting up the hot keys did not occur in the first 30 minutes, but they are a convenience--the switch works great "out of the box" without them. The CKL is pricey but worth every dollar, and they make a less expensive one if you have only two input devices instead of four.

So this product for its cost might as well be you handing a random person $300. It will work and then suddenly *not* work. I've even gone through RMA to have a replacement one sent. Even that one is trash. The USB 2.0 ports on both switches did not work consistently and often would fail to register inputs from mouse and keyboard, often the KVM switch will even just straight act like you're holding down keys until you basically unplug the keyboard *or* randomly slam on keys to get it to stop. The monitors will once every few weeks just stop registering input. None of these devices have issues when directly plugged into any system, the only thing that ever is a problem is the KVM switches. The bad news like with everything made in China is sometimes you get a great one and other times you get a dud, and if it was something cheap I wouldn't even bother writing a review but its $300, this isn't something cheap and I'm positive that sending me a 3rd one would just be the same thing, it works for a few weeks and then starts acting up. I just really wish there was a KVM switch out there that actually had a lower failure rate and wasn't just some expensive e-waste.

4 Years Later, this KVM is dying. I don't know what I should expect from a $200-ish KVM, but to me, anything with no moving parts should last a long time. It still technically works, but more and more frequently, Windows is failing to handshake with the KVM and I'm spending my first hour at work, unplugging everything and rebooting everything multiple times until Windows can finally connect. This is not sustainable so I've replaced the CKL with an $18 switch that suits my needs. Maybe 4 years is a good lifetime, but you will have to be the judge. The original review below was written in ignorance and I was able to get everything working by pressing the HotKey On/Off button on the front of the switch to the Off position. So, I guess I can't use the keyboard to change PC's but the little remote that is included has a wire that is plenty long enough for the remote to be within arms reach of me as shown in the photo (the extra slack from the wire is bundled with a twist tie and hidden behind the switch). I have a keyboard with built in card reader and I was hoping that this KVM would support it. But it doesn't. I am able to use one of the extra USB 3.0 ports on the switch to type on the actual keys of the keyboard, but not using the USB port meant for plugging in the keyboard prevents me from keyboard hot switching to a different computer. Also, it doesn't allow the card reader to read the smart card I have inserted. Worset of all, my primary computer won't even power on correctly with the keyboard plugged into the "right" port. So, I either have to give up one of the extra USB ports and leave the keyboard port unused or buy another keyboard. The switch is still a significant step up from my previous one, so I'll keep it. It's just a disappointing to spend so much money and not get all the functionality you want.

Works great for my two windows and one Mac. It came with only USB cables so I had to buy HDMI cables separately but its reasonable for the price. Switching is also reasonable (for me about 3 to 4 seconds, I would have liked near-instantaneous like 1 to 2 seconds but its still good for me). All in all its a great product.

I bought the most expensive 4 computer KVM that I found on Amazon because I wanted one that was up to date and likely to work. I have 3 Windows computers and 1 Linux computer attached to the switch. The switch supports two monitors, but I only use one. I had some difficulty getting the Linux computer to connect. Unlike the Windows computers, the Linux one only works if the switch is set to that computer when it goes through the boot process. Then it works quite well. There is a slight delay of a couple of seconds when switching, which is hardly noticeable. The switch is powered by a USB cable, so it needs a USB to be on before the switch turns on. I have mine connected to my router and it works. When I had trouble getting the Linux computer to connect, I sent an email to "support." I received a prompt reply. After two emails, the switch was working.

I have zero complaints thus far. I already own a CKL 2x2 USB 2.0 KVM so I knew what I was getting myself into when I bought this model to accommodate a new Macbook Pro. The previous USB 2.0 KVM I had was okay but I had a slew of issues with USB peripherals, particularly my webcam. The USB 2.0 model only has three USB ports, so I had to use a hub to connect my headset and webcam. This tended to overload the port and constantly cause disconnections. This is no longer an issue with the USB 3.0 model, which has four USB ports. I currently only have three computers hooked up: 1. Desktop (one HDMI and one HDMI to Displayport) 2. Lenovo Thinkpad Yoga X1 with Thunderbolt 3 dock (one HDMI and one HDMI to Displayport) 3. Macbook Pro 2018 with iVANKY 12 in 2 dock (two HDMIs) The audio was initially finicky, but I figured it out. You just need to make sure you have a monitor that can output audio, make sure this monitor is Monitor A, and set your computer's audio to this monitor. No problems after that. I don't use hotkeys as I find the wired remote easier to use for my set up. I took one star off because every now and then, when I switch to the Macbook, I get static on one monitor. I have to unplug the Mac dock and plug it back in. I can't tell if this is an issue with the dock or the switch but it never happened with the dock before.