PRS+ project seamlessly integrates into Sony UI and adds support for folder browsing, dictionary, key binding, book history, custom epub styles, games (Sudoku, Chess, Mahjong, etc.), localization (Catalan, German, Czech, English, French, Georgian, Russian, Spanish, and Simplified Chinese) and has built in fb2 to EPUB converter. Ebook applications Runs as an independent application. Adds support for FB2 / CBR / CBZ formats, drops support for LRF. Currently in beta state. Internal OS The PRS-T1, PRS-T2 and PRS-T3 run a heavily modified version of the Android operating system, which Sony mentions in the Legal Notices installed on the device. Its predecessors run the MontaVista Linux Professional Edition operating system with Kinoma FSK, a JavaScript virtual machine, optimized for devices with limited resources. Sales In December 2008, Sony disclosed that it had sold 300,000 units of its Reader Digital Book globally since the device launched in October 2006. According to an IDC study from March 2011, sales for all e-book readers worldwide grew to 12.8 million in 2010; 800,000 of those were Sony Readers. See also Comparison of e-book readers Amazon Kindle Barnes & Noble Nook Calibrean open source third party software to manage digital library with support of conversion between common e-book formats. Created originally for Sony e-readers, it supports over 30 different brands and types of readers. Kobo eReader OverDrive, Inc.ebook borrowing services for public libraries Tablet computer References External links . SONY Digital Reader . Sony products Dedicated ebook devices Electronic paper technology Linux-based devices