... size:15" 17" 19" 22" etc Touch screen:SAW or infared touchscreen or resistive touchscreen. Surface Acoustic Wave touchscreen* Resolution: 4096*4096, zaxis256 grade ... < 2mm0.080 inch*Single-point touch Life expectancy : more than 50,000,000 times*Surface hardness: equivalent to glass,7 Mohs ... 52” etc Aspect ratio: 4:3/16:9For 15,17inch screen, Max resolution:1280x1024,Brightness: 260cd/m2 ,Contrast: 450: ...