... b/g/n (optional)Battery:2000MAHInterface:3.5mm stereo audio jack for earphones, USB 2.0 High speedStorage Memory:SD/MMC ... of contents, jump to a certain page from the table of contentsG-sensoroptionalZoom in/out:supportLanguageEnglish,Russian,Spanish,Italian,French, ... to decoding various encoded filesPerformance: Quick Response:react in 0.2s. Faster page flips and file openingLong battery life:15 days ...