I highly recommend the SVUSBPOWER spare 4V DC power adapter from StarTech ...
Joshua Szanto, Amazon
17 July 2014
Summary: I highly recommend the SVUSBPOWER spare 4V DC power adapter from StarTech for this. It doesn't make sense not to use it. Even though this product supports power through VGA or USB (can't remember which one), it did not work well for us and so I only gave this product 4 stars. Otherwise it's super!
Good equipment at a fair price. (4-port USB hub! YAY!)
30 June 2014
Summary: This is a pretty good unit. I didn't know, however, that it required a special female to male VGA connection. Toher than that it works well. I does not come with nor require a power adapter (unless the computer your working with does not have USB.) A recommend this product and this seller to any computer enthusiast that wishes to use/service more-than-one system at a time from one keyboard, monitor, & mouse.
Expensive once you add up the price of required "accessories"
20 March 2014
Summary: Half a star off for cost. The problem is this requires cables to work, and maybe a power supply, plus ears if you want to mount it in a rack. The good of this is you can choose your cable length: 6 foot (p/n SVUSB2N1_6), 10-foot (p/n SVUSB2N1_10), or 15-foot (p/n SVUSB2N1_15). Other brands come with attached cables--lower cost, but you're stuck with a fixed length. This unit contains a four-port hub, which means you can plug in more than just a keyboard and mouse.
Summary: I do not use the video portion of this switch as I have a need to see all PC monitors at all times so have 7 monitors on my desk. The use of the switch for mouse and keyboard were my chief reason for purchasing this switch. It switches between PC's in 1 to 2 seconds every time and I switch 20-30 times a day without a hitch. I have found that the built in USB hub also is very useful and a plus ...
Summary: Purchased this KVM switch less than 6 months ago, and it is already malfunctioning, giving intermittent connectivity. I contacted Startech about it, and they recommended I replace the cables, But even a cable I never connected that was still in the bag failed intermittently. While I argue with Startech, I will be forced to purchase a replacement. My previous KVM switch lasted 7 years, and still works (just doesn't include USB). The SV431USB is money wasted; don't buy it.
Summary: I wanted to add a USB KVM switch to my computer network, replacing a PS/2 KVM switch. One key desire was a rack mounted switch to clean up the work surface. I researched various switches and selected the StarTech KVM since the multi-star reviews were positive, and the few 1 and 2 stars were focusing on the lack of some features those people needed. Since I didn't need those features (hot switching via keyboard) the StarTech was my choice...and a great choice it was.