Lenovo ThinkVision E55 LFD computer monitor 138.7 cm (54.6") 3840 x 2160 pixels 4K Ultra HD IPS Black Case High Dynamic Range 10 (HDR10) High Dynamic Range 10 (HDR10) High Dynamic Range (HDR) supported Yes Display diagonal (metric) 80 cm Pixel pitch 0 or 6252N processors 6") Contrast ratio (typical) 5000:1 NTSC coverage (typical) 72% Touchscreen No High Dynamic Range (HDR) supported Yes Panel type IPS Colour depth 10 bit DCI P3 coverage 75% LED backlight Yes Display brightness 400 cd m² Anti glare surface Yes Anti glare screen Yes Network Ethernet LAN data rates 1000 Mbit s Bluetooth No Wi Fi standards Not supported Wi Fi No Ethernet LAN Yes Multimedia Number of speakers 2 Built in speaker(s) Yes Built in microphone No Built in camera No Design Certification EU Energy Label (G class) TÜV Rheinland® Flicker Free TÜV Rheinland® Low Blue Light (Hardware Solution) Product colour Black Colour name Black Camera Built in camera No Ports & interfaces Built in USB hub Yes Number of upstream ports 2 USB Type A downstream ports quantity 4 USB Type C downstream ports quantity 1 Headphone out Yes VGA (D Sub) ports quantity 0 HDMI ports quantity 2 DisplayPorts quantity 2 HDMI Yes HDMI version 2 4 USB Type C DisplayPort Alternate Mode Yes Number of USB Type B upstream ports quantity 1 Number of USB Type C upstream ports quantity 1 USB 2