"The Kindle 2 is the second version of the highly
successful original Kindle eBook Reader from Amazon, which used an
eInk screen capable of displaying four shades of grey at 167dpi.
The original Kindle was only useful within the United States
though, as it could only download eBooks via its inbuilt CDMA EV-DO
mobile broadband on the Sprint network, incompatible with the
GSM/3G standards used in most other countries.
"This time around, the Kindle 2 is lighter than a typical
paperback at 289g, as thin as most magazines at 8.5mm, and easier
on the eyes with 16 shades of grey on its display. The new Kindle 2
still uses EV-DO on Sprint, counting out other countries from using
the wireless download capability, but it now also allows
side-loading of content via its USB port."