... . D525 CPU 3. 3*RS232,2*RS232/422/485,1*PS/2,1*VGA,1*LPT,4*USB 4. 2*GLAN 5. Wifi Optional ... (3*RS232, 2*RS232/422/485), 1*PS/2, 1*VGA, 1*LPT, 4*USB, 2*GLAN, 1*AudioExpansionWifi (Optional)ConstructionAluminum magnesium alloyColorBlackInstallationInstall on desk ... (3*RS232, 2*RS232/422/485), 1*PS/2, 1*VGA, 1*LPT, 4*USB, 2*GLAN, 1*Audio 12.1" Industrial Touch Screen Panel PC