LINKSYS USBHUB4C Compact USB 4-Port Hub Type: USB Standards: USB 1.1 Max Devices Supported: 127 Ports: 1 x Upstream, 4 x Downstream Transfer Rate: 1.5/12Mbps LEDs: Power Power Input: Bus Power/Self-Power with Optional Power Adapter Dimensions: 2.5 x 2.1 x 1.1