High Speed Mini USB 2.0 Slim HUB Adapter 4 Port 480 Mbps for Computer PC Laptop Mac 4 USB Ports Compatible with USB 1.1 and USB 2.0 Plug and play. USB bus powered, no external power needed. Size: 9cm x 4cm x 1.3cm - 3.54inch x 1.57inch x 0.51inch.