Dimensions： - 500GB~2TB: 129.5 mm x 80.8 mm x 16.1 mm (5.10" x 3.18" x 0.63") - 4TB: 129.5 mm x 80.8 mm x 24.1 mm (5.10" x 3.18" x 0.95") Weight： - 500GB~2TB: 185 g (6.53 oz) - 4TB: 294 g (10.37 oz) Color： - Iron gray/Military green USB Type：micro USB to USB Type Aa Connection Interface： USB 3.1 Gen 1 Capacity： 500 GB/1 TB/2 TB/4 TB Storage Media： 2.5" HDD Operating Temperature： 5°C (41°F) ~ 55°C (131°F) Operating Voltage： 5V Note: - Transcend Elite software is required for One Touch Auto-backup and AES encryption functions. - Dimensions given are exclusive of protruding elements. Certificate： CE/FCC/BSMI/KC/RCM/EAC Warranty： Three-year Limited Warranty *Warranty Policy* - Please click here for more information about the Transcend Warranty Policy. - Drop test is based on U.S. military drop-test standards MIL-STD-810G 516.6, and performed in non-operating state. This does not guarantee the invulnerability of this product under any circumstances. More information about Transcend's MIL-STD test can be found here. ＊System Requirement＊ Operating System： Microsoft Windows 7 Microsoft Windows 8 Microsoft Windows 10 Mac OS X 10.7 or later Linux Kernel 2.6.31 or later StoreJet 25M3 Transcend's StoreJet 25M3 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. Lightning-fast transfer speeds The StoreJet 25M3 external hard drive is equipped with the USB 3.1 Gen 1 interface, providing lightning-fast transfer rates of up to 5Gbps. Excellent anti-shock protection The StoreJet 25M3 features a three-stage shock protection system that meets US military drop-test standards to fully protect data stored on the drive. The three-stage shock protection system includes a silicone rubber case, an internal shock-absorbing suspension damper, and a reinforced hard casing. Two color options The StoreJet 25M3 comes in iron gray and military green. Pick your favorite color! One touch auto backup The StoreJet 25M3 is equipped with a one touch auto-backup button that instantly backs up your data with just one press*. The button also enables you to reconnect the hard drive to your PC without the need to unplug and reinsert it. *Transcend Elite software is required. Manage data with Transcend Elite A free download from Transcend’s official website, the Transcend Elite data management software is available for both Windows OS and macOS. Transcend Elite features backup and restore, data encryption, and cloud backup functions, helping you keep your important files organized, protected, and up-to-date!