1) USB 2.0 / 1.1 compliant and USB-IF certified 2) Supports data speed: 1.5, 12, 480MBps 3) One upstream port and four downstream ports 4) Supports both bus-power 5) Over-current detection and protection for each downstream port 6) Hot-swap plug and play connection 7) Daisy-chain connection of up to 127 devices 8) Four colors optional: Sivler, Blue, Red, Black