The hub supports cascaded installation with other USB 2.0 hubs, supporting up to 127 USB 2.0 device connections - a scalable solution for connecting multiple USB devices to a single host computer. The 7 port hub includes a power adapter, but can be powered through USB bus connection to the host computer - allowing you to install the hub as needed without worrying about the availability of a power outlet. More from the Manufacturer Host Interface: USB Package Contents: 7 Port USB 2.0 Hub - Hub - 7 ports - Hi-Speed USB 1 x USB 2.0 Cable 1 x Power Adapter 1 x Instruction Manual Host Interface: USB Product Type: USB Hub Product Type: USB Hub Manufacturer Part Number: ST7202USB Packaged Quantity: 1 Platform Supported: Mac Platform Supported: PC Limited Warranty: 2 Year Weight (Approximate): 10.20 oz Form Factor: External Form Factor: External Length: 3.9 Manufacturer: StarTech.com Product Name: 7 Port USB 2.0 Hub - Hub - 7 ports - Hi-Speed USB Brand Name: StarTech.com Brand Name: StarTech.com Country of Origin: Taiwan Height: 0.8 Width: 2.4 Total Number of USB Ports: 7 Product Color: Black Environmentally Friendly: Yes Total Number of USB Ports: 7 Number of USB 2.0 Ports: 7 Product Color: Black