UG19D1 USB 2.0 to VGA/DVI/HDMI Adapter for Multiple Monitors Upto 2048x1152 / 1920x1200 Each DisplayLink DL-195 Chipset

This works well to add a second (or up to six, I think, though you'd need to buy six individual adapters) monitor to your computer. I'm using it with a MacBook air. The only caveat is that video performance is bad, so I'd not recommend that you watch any type of video on the secondary monitors using this adapter. The USB bandwidth just doesn't seem to be able to keep up. Other than that, it works very well.-J

I needed a 3rd monitor for my Macbook Pro(early 2011 with osx 10.6), I was having too many word/excel/chrome/email etc windows open at one time, or at times I need to dedicate a screen for a Windows VM.This little dongle does the job most excellently.Don't expect it will smoothly play HD video, it is not designed for that purpose, it is a video card running off your USB 2.0, there are physical limits to what USB 2.0 can do.If you need is more screen space for way too many documents and spreadsheets, this device is fantastic way to get some more screen real estate. If you want to play video, play them on a display using the laptops internal video board.

I use this adapter, along with another older DisplayLink adapter to use 3 external monitors with my Macbook Pro. There is a tiny bit of lag, which makes mouse movements and audio syncing somewhat behind, but for the most part the adapter works as intended and works very well for extending a desktop beyond the regular limits of the computer you're using. Triple or quadruple monitor setups, or an external monitor on a laptop with no video output are easily accomplished with this.

Great product it does what I need it to do and I have no complaints whats so ever about it.

I use this to run a third display off of my laptop at work. My work requires me to have a number of applications open at once and to be constantly switching between them. Work provided an unimpressive laptop with a 1366 x 768 screen and a 19" monitor with a 1440 x 900 resolution. The only thing more baffling to me than management thinking that's a good solution for working on large Matlab models is that some engineers seem perfectly happy with it.I brought in a 23" 1080p monitor from home which I connect to the laptop and use the USB adapter for the 19" monitor. It works great. My slow laptop doesn't seem to run noticeably slower, I haven't seen any strange display behavior, and it's small enough that it kind of tucks up under the monitor at the base and no one notices it. The latter is important because it is a huge office to which a huge number of people have access. Someone might be tempted to walk off with it since it would fit nicely in a pocket.For Christmas I think I may buy myself another inexpensive 1080p monitor to use instead of the laptop screen. Life is too short to work on small, low resolution displays. Sure work should be supplying better monitors, but a lot of times you have to choose between being right and being happy. I'd rather be happy.