These External Enclosures will provide you with the best & newest features for Mass Storage and Data back up solutions. You can connect them to your computer by using either USB 1.1/2.0 or Firewire Interfaces.. Easy to assemble and suitable for mounting any 3.5" IDE hard disk drive. The case is powered via an external power adapter - included. And the most important innovation, this new enclosure has 2 built in Ball Bearing Fans for air circulation.