... :amplifier; stereo Loudspeaker; magnetic-proof,net card, sound card,integrated display card,2.SAW Touch screen:Screen size:15 ,17 19 ... one single locationResponse time: less than 16 msTouch activation force: 10 to 100gWe normally use SAW because it is more durable ... higher value between pricing and function.3.Grade A LCD display:Resolution: 1,920*1,080Screen size:15 ,17 19 20,22, inch Grade ...