Lenovo ThinkVision E55 LFD computer monitor 138.7 cm (54.6") 3840 x 2160 pixels 4K Ultra HD IPS Black Case Find the most comfortable position Find the most comfortable position for whatever you're doing with a simple adjustment of the foldable Smart Book Cover High Dynamic Range 10 (HDR10) High Dynamic Range (HDR) supported Yes Display diagonal (metric) 80 cm Pixel pitch 0 315 mm Aspect ratio 16:9 Display resolution 3840 x 2160 pixels Response time 8 ms Display diagonal 138 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