... optional)Operation system: Android 2.2OS languageinclude but not limited with: Chinese, English, Spanish, Italian, French, Portuguese, Russia, Germany, Arabic & etc ... ,DC IN: 1Speaker: built-in stereo, 8/1WPower source: 7.4V/3800mA rechargeable battery: 4~10 hoursAdapter: AC100-240V, 50/60Hz, DC 9V ... 3G USB Dongle, RJ45 convertor, Foldable USB keyboard, leather case with keyboard(pending)