Elo Touch E268447 5551L 54.6 UHD 4K Interactive Digital Signage Large Format Display Touchscreen: Touchscreen Brightness: LCD Panel: 450 nits IR: 405 Contrast Ratio (Typical): 4000:1 Regulatory Approvals: UL, FCC - Class A, cUL, IC, CB, CE - Class A, C-Tick - Class A, NOM CoC, CCC, China RoHS With RFID: UL, FCC - Class A, CE - Class A HDMI Port: 1 USB Port: Yes Other Ports: Input: AC power, RJ45 Remote Connector, RS232 connector, DisplayPort, Audio Line In Output: Headphone Out Power Supply: 100-240VAC 50/60Hz