This allows you to connect an internal IDE/PATA CD/CD-RW/DVD or hard drive externally thru USB port. The 3-in-1 converter provide connection for both 2.5 and 3.5 Inches hard drives. It is lightweight and easily adds a mobile storage drive to a notebook with speed up to 480Mbps. Save money by re-using any old drives. It includes 12v/110vAC power converter and driver software. Works with 5.25 Inches IDE drives and Windows 98SE, ME, 2000, XP & Vista. (Connectors: USB A Male to 40Pin/44Pin IDE Female; Length: 3ft)