... optional); 4, 9" Car Portable PC Headrest Model No.: HB902PC (9" Car Headrest Active/Portable Car PC Android 2.3 DDR2 ... up to 32G);3, Built-in Wifi function (3G is Optional);4, Built-in Speaker and FM/IR Wireless ... x1 Joystick; X2 C&T IR Wireless Folding Headphone IRDA and X2 IR Headphone Bag (Optional)Special Features: 1, Power: ... touch pen for easy operation. HB902PC 9" Car PC, In-Car PC, Car Auto PC