It also has 800 × 600 resolution and 8 levels of grey scale. (goodereader.com)
The story goes that everyone sees the world in grey scale. (gonintendo.com)
In September 1, 2010, Sony introduced the PRS - 350 Pocket Edition, PRS - 650 Touch Edition, PRS - 950 «Daily Edition» as replacements for the PRS - 300, PRS - 600 and PRS - 900, with both new models featuring 16 - level grey scale touch screens. (en.wikipedia.org)