IronKey Enterprise D250 4 GB USB Flash Drive (D2-D250-B04-4FIPS) - Rugged Metal Casing - Waterproof and Tamper-Resistant Tamper-Resistant - FIPS Validated 140-2 Level 3 (Products meet MIL-STD-810F) Always-On Data Encryption - AES 256-Bit Hardware Encryption High-Performance Memory - Dual-channel SLC or MLC Flash Portable Applications - Encrypted Backup