122 × 8 mm (6.9" × 4.8" × 0.3") Weight: 250 g (9 oz) Display: size: 15.5 cm (6 in) diagonal (approx 1/4 area of letter-sized page) resolution: 170 dpi, 8-level gray scale portrait: 90.6 × 122.4 mm (3.57" × 4.82"), 600 × 800 pixels | effective 88.2 × 115.4 mm (3.47 × 4.54 in), 584 × 754 pixels | for the Pictures application effective resolution is 600 × 766 pixels minimum font size: 6 pt legible, 7 pt recommended Memory: 256 MiB standard (200 MiB accessible), Sony Memory Stick Pro Duo 8 GiB, SD card up to 2 GiB (some non-SDHC 4 GiB cards may work), or up to 32 GiB with SDHC cards and version 1.1 firmware Lithium-ion battery, up to 6800 "page turns" per charge PC interface: USB port 2.0 Available case colors: PRS505/LC: Dark Blue PRS505/SC: Silver PRS505SC/JP: Custom Skin (James Patterson Special Edition) PRS505/RC: Sangria Red (introduced in August 2008) 2006 Model (Discontinued late 2007) PRS-500 Launched in September 2006, it has a six-inch E Ink display from and is 13 mm thick. There is an internal memory of 64 MiB. This model was superseded by the PRS-505 in 2007. On November 16, 2009, Sony announced that a firmware update is available to owners of the original PRS-500. This update "will allow your PRS-500 to support the ePub and Adobe DRM format and add the ability to re-flow PDF documents". Owners must send the ereader in to the Sony Service Centers for the updated firmware. Specifications Size: 175.6 × 123.6 × 13.8 mm (6.9" × 4.9" × 0.5") Weight: 250 g (9 oz) Display: size: 15.5 cm (6 in) diagonal (approx 1/4 area of letter-sized page) resolution: 170 dpi, 4-level gray scale portrait: 90.6 × 122.4 mm (3.57" × 4.82"), 600 × 800 px | effective 115.4 × 88.2 mm (4.54 × 3.47 in), 754 × 584 px minimum font size: 6 pt legible, 7 pt recommended Memory: 64 MiB standard, Memory Stick (Pro Duo High Speed not supported. Normal memory sticks are only supported up to 4 GiB, despite Sony compatibility claims) or SD card expansion up to 2 GiB (some non-SDHC 4 GiB cards may work) Lithium-ion battery, up to 7500 "page turns" per charge PC interface: USB port 2004 Model Sony Librie EBR-1000EP Launched in April 2004, it has a six-inch E Ink display and a Qwerty keyboard that was released in