Taken from this site: http://mini-projector-review.toptenreviews.com/m2-micro-projector-review.html
In projector, Should be check firstly 'Quality of Picture' :
There are a lot of different factors that contribute to a quality
picture, including projection type, resolution, contrast ratio, refresh
rate and brightness. This mini projector offers the LCoS projection
type, and the lamp uses triple RGB LEDs. The native resolution for this
product is XGA (1024 x 768). This is one of the highest resolutions we
saw in all the products we reviewed. Additionally, the unit can support
resolutions up to 1280 x 720 and can reach upwards of 30 frames per
second. The contrast ratio is also fairly high at 2,000:1. This enables
the difference between the light and dark areas to be quite distinct
although the blacks will only be as dark as the initial non-lit screen.
The refresh rate of this product is 60 hertz, which is less than what
you might get on a larger projector, but for a mini projector, we were
pleased with the results. The brightness is definitely the biggest
difference between the mini projectors available. This mini projector
has one of the brightest lamps available, boasting 110 ANSI lumens.
Though it is quite high for the size, you will still need a moderately
dim room in order to see the picture clearly and to provide the best
contrast between light and dark.
A few of the other picture options with this mini projector include a
variable image size of 10 to 100 inches. This is dependent on the
distance the projector is from the screen. This mini projector also has
an aspect ratio of 4:3. When viewing something in the high definition
16:9 format, the unit will just display the black bar on the top and the
bottom of the image. If you discover there is a problem with the image
being stretched or skewed, make sure the device the projector is hooked
up to is also on a 4:3 aspect ratio setting.