Product Specification of Transcend 25H3 Rugged USB 3.0 External HDD (1TB/2TB/4TB) Military-grade shock resistance* SuperSpeed USB 3.1 compliant and backwards compatible with USB 2.0* Advanced 3-stage shock protection system Durable anti-shock rubber outer case Advanced internal hard drive suspension system Quick Reconnect Button - re-enable safely removed USB hard drive without unplug and reinsert One Touch Auto-Backup button 256-bit AES file & folder encryption* Exclusive Transcend Elite data management software StoreJet® 25H3 The StoreJet 25H3 USB 3.0 portable hard drive combines the superior performance of USB 3.0, vast storage space, eye-catching enclosure, and a three-stage shock protection system that meets U.S. military drop-test standards. What else can you ask for?