Features 12" 1024 x 768 TFT LCD, LED Backlight Fan-less Cooling System COM2 and COM3 [RS485] support MPI 187.5K, please use one at one time Support SD card expand storage capacity PCB coating process ensures high reliability to resist from corrosion in harsh environment COM1 and COM3 [RS485]2W support MPI NEMA4 / IP65 Compliant Front Panel Built-in Power Isolation Specification Contrast Ratio: 500: 1 COM Port