Transcend’s StoreJet 25H3 ruggedized external hard drive combines supreme shock-resistant qualities with the USB 3.1 Gen 1 interface, allowing for ultra-fast file transfers and the highest level of anti-shock protection. With up to 4TB storage capacity, the StoreJet 25H3 eliminates all fears of running out of storage.. . Military-grade shock resistance . Durable shock-resistant silicone outer shell . One-Touch Auto Backup Button . Advanced internal hard drive suspension system