... are widely used for teaching, video conferencing, video playing , multimedia center, meeting, showing, gaming, government, business, advertising, displaying ... 5SpeakerLeft And Right Bi-channel; Amplified Output; Multimedia Speaker 6Operation SystemWin7/XP/Vista/Linux OfferedAll Hardwares ... HD/UD LCD/LED Interactive/Multimedia Touch Screen System/Monitor/Frame/Overlay/Flat Panel/TV(All-in-one PC) ...