... 4000:1surface: anti-glarebacklight: LEDcontrol method: RS232 controlLCD video wall system signal support:DVI/HDMI/VGA/AV/YPBPRvideo wall monitor power ... RS232, HDMI,DVI,VGA,Y Pb Pr ,AV6) FHD video wall unit--- High brightness,high contrast,High gamut .7) Flexible ... Description55 inch ultra narrow bezel lcd video wall can be used in below fields: Conference and meeting rooms, office building, lobbies, ...