If you have a multi-display setup for your desktop at work, you really feel limited when working on your single screen laptop while at home or on the road working remotely.
A USB powered monitor is the easiest way to add an additional display to your laptop.
Besides working out of a hotel room with a single display, I often find myself at client presentations, and either their boardroom projector is not working or the meeting room does not have a display system. A USB powered display enables you to give the client a perfect view of your presentation without having them surfing over your shoulder.
These devices have been around for a few years, but have recently dropped to a level that makes it a no-brainer.
I have personally been using one manufactured by AOC, currently available from Amazon Canada for under $120. It features a 15.6" diagonal display capable of 1366 x 768 resolution. The best part is that it is fully powered off of the USB port on your laptop. Plug in one cable and you are good to go! The unit is light and fits in right in my laptop bag.
** Note: you will need a USB 3.0 port to drive this unit.
Part Number: e1659Fwu
More Info: AOC Website