What makes the SD3650-TAA unique is that you can connect dual HD video monitors using DisplayPort and HDMI ports, plus we increased the USB 3.0 accessory expansion ports to four, ideal for a flash drive so it can transfer data at 5Gbps. The dock also features Zero Footprint Mounting, so it can be mounted to the back of a VESA-compatible monitor using a Docking Station Mount (sold separately), perfect for desks with limited space.