Compatible with USB 3.0 and USB 2.0. Simply plug in the included power supply and USB cable. Automatically recognized by Windows operating system, so there is no software to install or configure needed. Drag and drop file saving, right out of the box. Built-in power management ensures power-saving operation. Specification: Storage capacity: 500G, 1TB, 2TB, 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 Include: 1*Portable hard drive If you have any questions about the product, please contact me, we will contact you within 24 hours and give you a satisfactory answer. Please allow slight dimension difference due to different manual measurement.