general size,surface polishing, without blemish,encaosulation IC, with usb and SD card interface,easy to use,and durable. ... shell.surface polishing,writhout blemish,encapsulation IC,bitmap screen,with english display function,with usb and SD card interface,no memory card ... SD card or U plate, and then put the on-board MP3; The on-board MP3 is inserted into the 12 V car cigarette ...