Characteristics and Interoperability Multi-purpose USB 3.0 HUB with 7 ports that is ideal for a variety of situations extensively utilized in laptops, PCs, and other gadgets that need USB ports for expansion or external displays. Excellent for use in a dorm room or at home. IMPORTANT NOTICE: This device is intended to provide additional USB ports for file transfers, not for charging. The power supply has the following specifications: 3.5*1.35mm5V 1A; if your hard drive is larger than 1TB, the power supply will not work for you. This link has nine options; if you want USB 3.0 with power apply, please select the one that best suits your needs. The issue of inadequate power can be resolved by the power supply.