... 2Overall Power Consumption Less than 4W in working time(do not plug USB disk, mobile storage,wireless keyboard ... interface right away.Menubutton: pop up option menuReturnbutton: Return to last page/operationArrowkeys: up,down, left, rightOK key: toconfirm ... playingNext songkey: press this key to next program in playingZoom out:to narrow imageZoom in: to enlarge imageMutebutton:1. mutefunction, ...