Patriot Bolt 4GB USB 2.0 Flash Drive with 256-bit AES encryption, PSF4GBTUSB 256-bit AES data encryption/decryption with built in safeguard; drive locks down and reformats after 10 intrusion attempts Hi-Speed USB 2.0 Compatible with 27MB/s READ and 13MB/s WRITE speeds 512-bit RSA engine for user authentication Encryption feature compatible in Windows OS only 5 Year Warranty