USB HUB:USB 2.0 Compliant and USB-IF certified - 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 port - Hot-swappable Plug & Play connection - Daisy-chian connection of up to 127devices