... 3, With Wifi (3G is optional); 4, 9" Car Portable PC Headrest; 5, USB/SD: Up to 32G Model ... No.: HB902SPC (9" Car Headrest Active/Portable Car PC + TV Pair)Car PC Specification:1, 8V-16V Wide ... Voltage;2, USB/SD Reader (up to 32G);3, Built-in Wifi ... with touch pen for easy operation. HB902SPC 9" Car Headrest PC+TV Pair, Car PC, In-Car PC, Car Auto PC