USB 2.0 and USB 1.1 Compliant and USB-IF certificated Supported data speed;1.5/12/480 Mbps One upstream and seven downstream ports Supports both bus-and self-powered(automatic switching 2A power adapter included) Over-current detection and protection for each down-stream prot Hot-swappable Plug&Play connection Daisy-chian connection of up to 127devices Dimensions:81*46*24mm
