eBook support extension DRM Text : ePub (Adobe DRM protected), PDF (Adobe DRM protected), BBeB Book (PRS DRM protected) Unsecured Text : ePub, BBeB Book, PDF5, TXT, RTF, Microsoft Word (Conversion to the Reader requires Word installed on your PC) Gray scale: 8-levels gray scale Internal Memory: 512MB, 380MB accessible Expanded Memory: Support for Sony Memory Stick Pro DUO and SDHC up to @16 Gb Font Size: 5 adjustable font sizes Battery: Sealed internal, up to two weeks of reading on a single charge MSRP: US$170 Available case colors: PRS-600BC: Black PRS-600SC: Silver PRS-600RC: Red Daily Edition PRS-900 The PRS-900 was launched in December 2009 and it is also known as the "Daily Edition". The PRS-900 was announced at the same time as the touch-screen PRS-300. It is Sony's Top of the Range device and it priced at US$399. The device has a larger display (7"), 16-levels of grayscale, touch screen and 3G wireless access (through AT&T Mobility in a manner similar to the Kindle's whispernet) which enables computer-free access to the Sony eBookstore in the United States. Like earlier Sony Readers the display can be oriented horizontally, enabling a landscape style mode, and adds a new mode displaying two portrait-mode pages side-by-side (in a similar fashion to viewing a book). Specifications Size: 206.4 × 127 × 15.1 mm (8.1" × 5" × 0.6") Weight: 360 g (12.75 oz) Display: 7.1 inch touch-screen Resolution: 600 × 1024 pixels Gray scale: 16-levels gray scale Internal Memory: 2 GiB, 1.6 GiB accessible Expanded Memory: support for Sony Memory Stick Pro DUO and SDHC up to 32 GiB. According to Sony, it can take up to a 32 GiB Memory Stick. But, according to its manual, 32 GiB memory sticks are not guaranteed to work. Therefore, it is recommended to use 16 GiB memory sticks. Font Size: 6 adjustable font sizes Battery: user replaceable, up to two weeks of reading on a single charge Wireless: AT&T 3G wireless (free), access to eBook store only, no Web browser MSRP: US$250 Available case colors: PRS-900: black 2008 Model (Discontinued late 2009) PRS-700 The PRS-700 was launched in October 2008, it has a touchscreen that can be used as a virtual keyboard. It became available in the U.S. in November 2008 at a MSRP of $399; in April 2009 it was selling for $349.99. Unlike Sony's LIBRIé, a close cousin of the Sony Reader, the PRS-500