1.custom LCD advertising machine 2.easy use,durable,USB auto update,high ... idea,promote, 4.CE,RoHS,SGS 42 inch LCD advertising machine (factory price, good quality, timely delivery) Main Board ... or CF cards, which should be inserted to the card slot, so that the files can be played normally. Disadvantage ... it would be better to buy this LCD advertising machine. There is no need to replace the files very ...