Iseebiz4K HDMI Multi-Viewer, 4 in 1 Out HDMI Screen Switch with 5 Modes, Support 4K@30Hz/2K@60Hz Seamless Switch for Game Studio, Exhibition Hall, Video Meeting, Surveillance, Display Mall etc.

Wow, this is great. I can watch 4 shows or sporting events at once with no loss in picture quality whatsoever. I used to have 3 tv’s mounted on my wall but this is going to allow me to enjoy the same level of entertainment with only one. I had this whole thing setup in under 10 minutes too. I just hope the device lasts, because it seems almost too good to be true. Will update as needed. As of now, would highly recommend.One note: only the single screen and 4 screen mode are truly useable. The other layouts squish the video too much to really enjoy it. That’s not a problem for me, but just something I thought I’d mention. Also, the remote is a little finicky, but I’ll live.

I bought this device to allow my family and I to use our theatre room to play different video games split on the same screen. There is clear latency when the system is processing multiple images. Some games this is not a problem, where reaction time is negligible. Most competitive games simply don’t work due to latency. We’ve still got plenty of use out of the system. I would buy a higher end version that greatly reduced this lag if it were available. My only real complaint is that the level of latency varies, sometimes being unusable. And sometimes it’s hardly noticeable. Normally I do a reboot when it gets too bad, and sometimes that doesn’t do anything.

This device simply didn't work. The PCs I connected seemed to register that it was connected to a display, but there was absolutely no output signal going from the multiviewer box to my TV. I tried different cables, different displays, and even returned the one I'd received initially and got a replacement, but both exhibited the same symptoms. The only difference was that the little power light started out red then changed to yellow once everything was started up on my first box, and was yellow throughout on the replacement.Oh, and the remote didn't work on either the original or the replacement. A complete and utter waste of my money, and the only reason I'm not returning the second is because it's incredibly inconvenient to do so.I can't seem to find any kind of support options that aren't Amazon either (who had nothing to suggest after I listed all the things I'd already tried - and why would they, there's no reason for them to even know what this device is). There's no contact information on the manual, nothing. Although I can certainly see that the seller leaves comments on all the positive reviews, and ignores any that have had issues. Great service.

This does work to display 4 inputs on a single monitor which is great and the reason we purchased. There are a few layouts to choose from and frankly has the layouts I wanted (2 side by side, 4 equally sized). I think the only configuration that might be nice would be a 2 (top/bottom rather than left/right). I'm thinking the images could be larger since most aspect ratios are wider than they are tall. I like that you can choose the audio source in the 4 configuration and switch between them.I've noticed strange behavior with mixed resolutions. In one case where I had an appleTV 4K connected but had the unit set at a 1080P resolution the image was dark. I thought I was going to have to return the unit but then realized when I bumped the resolution up to 4K it wasn't bad. There was a problem with this though because the TiVO I have only outputs at 1080P and if the unit was set to 4K I would get no image out but some sound. If I then switched the unit to 1080P resolution it still would not work. I stopped messing with it and just plugged my TiVO back in to the TV and left the spot open. When all inputs are 4K it seems to work really well.The remote works when it wants to. I'm not really sure how or what impacts it but sometimes it works on first click sometimes it needs a little love and it takes a bit of convincing.All that being said I like the system. It has the described quirks but it is a great price.To recap the three things I would add: a better remote, a 2 image setup (top/bottom), better support for multiple input resolutions

Works great, no noticable lag on any screen. Price was good at $169. I wish there was a 4k@60Hz model available, but this product is great for what it is.