IronKey 4 GB Secure Hardware-Encrypted USB 2.0 Flash Drive D20402A Your IronKey gives you military-grade security in the palm of your hand, allowing you to protect your data, passwords and web surfing with hardware-based encryption. 9 megabytes per second read speed. 15 megabytes per second write speed. USB 2.0 High Speed or 1.1. Windows XP or Vista. No software or drivers to install. Does not require Windows administrator privileges. Waterproof to military specifications. Tamper-resistant rugged metal case.