Acer U301 USB 3.0 Dock Dual display output Fast data transfer USB Ports: 1 x USB 3.1 Gen1 Type-B port; UFP (Connect to Laptop) 4 x USB 2.0 Type-A port (back) and 2 x USB 3.1 Gen 1 Type-A port; DFP (front) Ethernet: 1 x RJ-45 connector (Connect to Ethernet 10/100/1000 Mbps) Audio Jacks: 1 x 3.5mm Audio (Headphone/Speaker Jack)