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Question: There appears to be a (micro usb?) power input in the rear center of the monitor. What connection is this and can it be used to power the monitor?
Document: I don't have a ton of other field monitors to compare this to overall, so I will simply offer a couple of observations.Power -I have used this on a few shoots and the main thing I would have liked to see is some sort of battery level indicator. The interchangeable plate is nice and the battery life is decent, but you get no warning before the battery dies. The colors freak out and flash purple, and then it goes dead.
When I set the resolution of the monitor in windows to 1280x800, I get a resized sharpened picture (more on this later). No matter how I tweak the settings for overscan, 1:1 or input, i cannot get a true full resolution picture.As far as using with a camera, I'm using a Nikon D7000 so it doesnt output a clean HDMI signal to begin with. It's usable and has been great on a couple recent shoots.My other grip is the sharpening.
Used on two pro shoots. I like it a lot. Comes with lot's accessories. Has a ton of adjustments Looks and works like a pro.
Just used this on our first shoot yesterday. It looks great - is plenty bright - and mounting it to an extra light stand was simple and easy. Much easier to pull focus on our FS700 now.
Screen looks good. easy to use overall. menu could be a little simple to select and set what you want but once you get used to it it is simple. great for the money. resolution is nice. Color and contrast are very good.
I like this thing a lot. it has a pretty decent picture and works well for most things. It looks like the resolution is not quite on par with  more expensive models to me. I have used a SMALL HD and the IKAN and Marshal. It's close and I bought it as a good starter for a kit I was building and it definitely does the job. Not quite as elegantly but very usable.
This is my second Lilliput monitor and this one is much nicer than the first.An all metal casing, much better resolution and an external battery plate.It even comes in a nice little case.
They could be quite helpful with a camera that doesn't already have these features, but otherwise it makes more sense to use one consistent set of displays - the ones already on your camera. In fact, the way I prefer to use this monitor most is solely for composition with all displays turned off.
The cable that connects between the monitor and the AC adapter is a really weird sort of mess. There are bare wires hanging out for a tally light and an extra DIN plug - i'm assuming for chaining devices or something. I wish I could just plug the AC adapter directly in and not have to mess with these weird cables.
The monitor itself is built well - the casing is metal. The screen has good resolution and colors, and is adjustable. I was able to calibrate it fairly well with a Spyder3 colorimeter and then further by comparing to my camera. Keep in mind that this monitor is very cheap for what you get and there are reasons for it. The UI isn't perfect, the buttons don't always respond on first click (not sure if this is a safety precaution?).
Answer: USB is for firmware updates which I have not tried. Power is only through the 4pin Xlr connector.