... , 4. one year guaranty Touch screen features: Optional size:15" 17" 19" 22" etc Touch screen:SAW or infared touchscreen or ... 50,000,000 times*Surface hardness: equivalent to glass,7 Mohs*Dust-proof, explosive proof*Durability:5years Grade ... ; stereo Loudspeaker; magnetic-proof,net card, sound card,integrated display card, Operation system: Windows2000/XP/Vista, RedHatLinux/FedoraCorePower supply ...