Main display: 6-inch E-ink panel Display controller: Epson display controller Backlight: no backlight without no any radialization Display size: 6 inches (800 x 600 pixels) Processor: Arm9 Core (Samsung S3C2440) Operating system: Linux 2.6 RAM memory: SDRAM 64MB Battery: Li-ion, 1,700mAh Battery life: 11,000 screen refresh (estimated 3 months based on reading speed of 500 pages per week) I/O: 3.5mm stereo audio jack for earphones USB port Connectivity: high speed USB client Built-in Wi-Fi (IEEE802.11b/g) (optional) SD card: up to 4GB, supports SDHC Format supported (with cyrillics supporting): PDF, TXT, CHM, FB2, RTF, TCR, PDB, OEB, HTM, PRC, HTML, EPUB, DJ, VU, IW44, IW4, and DJV Audio format supported: MP3 (32 to 384Kbps) and WMA (32 to 192Kbps) Font size changing function: 5 sizes Other features: search book by filename, auto-resume, and bookmarking Page number indication: yes Languages: English, French, Russia, Dutch, and German (can be customized) Grayscale: 16 level Accessories: gift box packaging, IB (English with 128gsm woodfree paper), stereo earphones, USB cable (1m long), battery (mercury free), USB charger, and leather case