... large selection fullfil your different request Touch screen features: Optional size:15" 17" 19" ... 22" etc Touch screen:SAW or infared touchscreen or resistive touchscreen. ... Aspect ratio: 4:3/16:9For 15,17inch screen, Max resolution:1280x1024,Brightness: 260cd/m2 ,Contrast: ... with trackball.*WIFI, GPRS Modem*Camera, Thermal /Laser printer, bluetooth connection, etc. Color: we can paint ...