Turn a single usb 20 port into 4 external usb 20 ports this 4 port usb 20 hub connects to one usb 20 port on a mac or pc computer adding four usb 20 ports allowing you to maximize the number of high speed usb peripherals connected to your computer the hub supports cascaded installation with other usb 20 hubs supporting up to 127 usb 20 device connections a scalable solution for connecting multiple usb devices to a single host computer the 4 port hub includes a power adapter