1.CPU:Rockchip 2.Operating system:Android 2.2 3.Resolution: ... Lithium polymer (2,800mAh) Mode of operation: mechanical keypad E-book: ANSI, Unicode TXT, Doc, PDF, HTML, FB2, PDB,and EPUB ... ) frequency range: China: 87.5 to 108 MHz (50 step) World: 76 to 108 MHz (50 step) Channel: preset 30 channlesBit ... G-sensor USB port: USB 2.0 7 inch TFT digital electronic book