This is an ATEN 19" dual-rail LCD console — a rack-mount drawer combining a 19" VGA monitor and integrated keyboard/touchpad into a slide-out 1U-style tray, with an extra console port for extending or cascading to a second local station. Unlike this catalog's combo-KVM version (which bundles an 8-port switch), this is the plain integrated console/monitor-keyboard drawer on its own, typically used together with a separate KVM switch elsewhere in the rack, or simply as a dedicated local screen/keyboard for a rack of equipment. 'Dual Rail' and 'LONG RACK' describe the mounting rail kit for deeper server racks, and the (US99KB/USKB/SPKB)/(US/EU/UK/OUT) options set the keyboard layout and regional power cord included.