... OUT 4.Built-in 4GB NAND Flash 7 inch ebook reader 1.7" TFT LCD TOUCH SCREEN/Resolution:800*4802.Support ebook ... information query system11.Built-in 4GB NAND Flash ,Suport micro SD card12.Accessories: earphones, USB line, specifications, power adapter, ... , 3, 5, 10, 15, 20minPower life6-8HoursExpansion slotTF card slot 16GB maxOther interfacesUSB2.0Accessoriesearphones, USB line, specifications, power ...