Iseebiz 4K 4 in 1 Out HDMI Multi-Viewer, 4K@30Hz 2K@60Hz HDMI Screen Splitter with Sound Switch 4 Modes, Seamless Switch for Engineer, 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.

Set up the multiviewer with my Vizio P65 and 3 Directv boxes and an Xbox One. The 4 way split looks great and all the video modes work but I can't get the audio to work. Have an optical cable from the optical out on the TV to a Vizio soundbar and nothing worked in any of the modes. Then switched to just the TV speakers and still nothing. Please help, this is exactly what I was looking for but I need audio!

Wanted to have 4 computer screens on one 65" 4K TV. First unit wouldn't work with Samsung Q70 4K 65" TV at any resolution. Apparently an "HDMI handshake" failure. Worked with Iseebiz support via email but could not resolve. Returned for replacement. Replacement works flawlessly! Now have four 1080p computer screens on the 65" 4K TV and all are very clear. No stretching or compressing in quad mode. It's like having four 32.5" monitors in front of me. Subtracted 1 star for having to go through the return/replacement process. Dave at Iseebiz email support was very helpful even though we could not fix the problem without a replacement. Thanks. UPDATE...Might have discovered a quirk with this at 4K output. All was good for 3 days. Turned the unit off overnight. Next morning nothing...at any resolution. Seemed like the same problem I had with the first unit. So I went through the same process I did when it first worked. Connected ONLY the output hdmi cable to TV and powered on with no inputs connected. VIOLA! It's working again. Plugged in each input and things are back to where they should be. Quirk or bug...you decide. Hope this helps someone.

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.

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.

Workes as described although I didn't anticipate the aspect ratio issue. Runs two Xbox Ones with great picture quality and no lag.

Some latency. A couple of frames. But, it works with every input device I have thrown at it!

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.