Mine is a 10" size screen just like a I pad 3 size.
It has a mini sd and I added a 32gb mini card
I just looked it up on ebay and since I bought it for $149
the 10" has now dropped to $119
they have a newer faster one now 1.5 ghz and 4.0 android
for $149 and the screen is a newer Capacitive Touch Screen (sense activated) where mine is pressure activated.

So now that we know what I have do we have a solution
to why it blinks off as soon as I call up a web site. Note that
some stay on and work fine. but some open and in 2 seconds
shut off...?