Transcend 640 GB 2.5-Inch USB 3.0 Super Speed Portable External Hard Drive TS640GSJ25D3 (Black) Super Speed USB 3.0, connection bandwidth up to 5GB/s, backward compatible with USB 2.0 Driver-free Plug and Play with 640GB capacity, allow you to bring all the media files anywhere Eye catching LED power/data transfer indicator Come with a matching travel pouch, never worry about getting it scratched USB powered - no external adapter needed