ADS Tech USB Ultra Hub 4 (USBH-604) Never gnash your teeth over IRQ conflicts again! Attach four USB peripherals directly to your computer, and daisy chain up to 127 in all No need to open your computer case & no confusing cables Provides one UP port to connect to your computer, and 4 Down ports to attach additional devices to your desktop or notebook PC Unique tiered star topology lets you connect up to 6 tiers - 127 devices - to your computer!