Kindle touch 3G WiFi has Amazon's 6" diagonal most advanced E Ink multi-touch screen, optimized with proprietary waveform and font technology, 600 x 800 pixel resolution at 167 dpi, 16-level grayscale.
Size (in inches) 6.8" x 4.7" x 0.40" (172 mm x 120 mm x 10.1 mm). Weight 220 grams. On-device storage up to 3,000 books or 4 GB internal (approximately 3 GB available for user content). Free cloud storage for all Amazon content. Battery life a single charge lasts up to two months with wireless off based upon a half-hour of daily reading time. Keep wireless always on and it lasts for up to 3 weeks. Fully charges in approximately 4 hours via the included USB 2.0 cable connected to a computer.