The Seagate Expansion portable drive provides extra storage for your ever-growing collection of files. Instantly add space for more files, consolidate all of your files to a single location, or free up space on your computer's internal drive to help improve performance. Setup is straightforward; simply plug in the included USB cable, and you are ready to go. The drive is automatically recognized by the Windows operating system, so there is no software to install or configure. Saving files is easy too–just drag-and-drop. Take advantage of the fast data transfer speeds with the USB 3.0 interface by connecting to a SuperSpeed USB 3.0 port. USB 3.0 is backwards compatible with USB 2.0 for additional system compatibility.  Specifications: Brand: Seagate Name: Seagate Expansion Model: STEA2000400 Storage capacity: 500G, 1TB, 2TB, 3TB, 4TB (optional) Connection: USB 3.0 Hard drive size: 2.5 inches Max transfer rate: 120MB/s Item size: 11.7 * 8.0 * 1.48cm / 4.60 * 3.14 * 0.58in (L * W * H) Item weight: 170g / 5.99oz Package size: 14.5 * 10.5 * 3.2cm / 5.70 * 4.13 * 1.25in (L * W * H) Package weight: 207g / 7.30oz Package List: 1 * Portable hard drive 1 * USB 3.0 cable 1 * User manual (22 languages) Note:  PN codes are "manufacturing batch numbers" , they are not unique. Product packaging, chuck body and accessories PN codes are respectively applied by manufacturer, so they are different.