If you are using a desktop computer， connect the chassis behind the motherboard USB interface， use the front is also likely to result in insufficient power supply， because the front of the adapter board USB interface is USB interface! If you are using a notebook computer， and notebook interface， not through the direct conversion of other USB hubs， otherwise it may cause insufficient power supply! Part of the motherboard Southbridge chip is not to force， USB interface can not be up to standard 5V voltage， the power supply may be insufficient. Products can be connected: You can then extend the U disk， camera， printer， mouse， keyboard， game controller， USB light， USB fan， USB devices， and so on. Specification: USB 2.0 Interface， compatible with USB 1.1. Male to Female USB Extension Cable. High quality molded connectors for tight fit locations. Extend the distance between your USB peripheral and your USB hub or computer. Supports High Speed 480Mbps， Full Speed 12Mbps & Low Speed 1.5Mbps. Length: 3M Package: 3M USB Extension Cable x 1