The current trend of making laptops thinner now means that many of the connectivity options you are used to seeing have been replaced by a single USB Type C socket.
Simply attach this unit to the USB Type C connector on the laptop and you will gain an HDMI socket, a DVI socket and a VGA socket.
PLEASE NOTE - If two or three of the sockets are connected, then only one socket can receive the video signal, priority is - DVI, HDMI followed by VGA Supported resolutions are DVI - up to 1080p @ 60hz HDMI - up to 4k @ 30hz VGA - up to 1920x1200 @ 60hz