Dell d3100 docking station

You can easily connect laptops to Ultra HD 4K displays, Full HD displays, and other external devices

With the Dell Docking Station – USB 3.0, you can connect your laptop to up to three additional monitors, a variety of external devices, and the Internet with just one cable.
It features a convenient way to extend the capabilities of your portable PC and customize your desktop computing environment.
This stylish, compact dock offers enhanced options for productivity and entertainment with ultra-fast connectivity and support for Ultra HD 4K displays.
Designed for Ultra HD 4K resolution, this USB 3.0 Universal Docking Station gives compatible PCs the ability to display 4K resolution when plugged in.  

• 2 x USB 2.0 – 4 pin USB Type A
• 3 x SuperSpeed USB 3.0 – 9-pin USB Type A
• 2 x Display/Video – HDMI – 19 pin HDMI Type A
• 1 x Display/Video – DisplayPort – 20-pin DisplayPort
• 1 x Network – RJ-45
• 1 x Headphone – Output – Mini Phone 3.5mm
• 1 x Audio – Output – Mini Phone 3.5mm
• 1 x SuperSpeed USB 3.0 – 9 pin USB Type B