Transcend StoreJet M3 500 GB USB 3.0 External Hard Drive TS500GSJ25M3 Military-Grade Shock Resistance - Designed to meet U.S. military drop test standards Advanced 3-stage shock protection system - Combines a rugged slip-resistant silicone outer shell, a reinforced hard casing, and an internal hard drive suspension damper. USB 3.0 and USB 2.0 connection options - Bandwidth up to 5Gb/s in USB 3.0 mode and 480 Mb/s in USB 2.0 mode OneTouch Backup 2.5" SATA HDD