The Transcend 4TB USB 3. 1 StoreJet 25H3 Portable Hard Drive offers an impressive level of anti-shock protection without sacrificing its slender good looks. High storage capacity and a convenient auto-backup button. It is SuperSpeed USB 3. 1 (1st gen) compliant and backwards compatible with USB 3. 0/2. 0. It has a three stage shock protection system, and includes a durable anti-shock silicone outer shell. Free download of Transcend Elite & RecoveRx software. Additional features include: connection bandwidth up to 5Gbits per second, USB powered, power saving sleep mode, plus more.