***NEW without box!*** still has plastic wrap on it. ----- One-stop upgrade for your Windows tablet, laptop, or desktop. Connect up to two additional monitors and nine accessories through a single USB cable. Includes the latest drivers and firmware for compatibility with Windows 10 and earlier. Backward compatible with most USB 2.0 PCs. Features two graphics ports: an HDMI port and a DVI-I port with VGA adapter for mirroring/extending your Windows desktop to external monitors, a Gigabit Ethernet port, audio input/output, two USB 3.0 ports, and four USB 2.0 ports. With graphics, networking, and USB hub chipsets that have been selected and tested together to ensure maximum quality, the UD-3900 provides: An HDMI and a DVI port for connecting two external monitors and support for resolutions up to 2560×1440* (HDMI only) and DVI / VGA up to 1920×1200 (DVI-to-VGA adapter also included) An RJ-45 Gigabit Ethernet network port (also supports 10/100 Ethernet) External headphone/speaker output jack and a microphone line-in Two USB 3.0 ports for accessories (such as an external hard drive or another USB graphics adapter) Four USB 2.0 ports (great for legacy devices such as keyboards, mice and printers)