Drive bay design adds one ExpressCard/54 (USB-based) slot to desktop computers allowing older systems to use the latest ExpressCard adapter cards. Installs in any available 3.5?or 5.25?device bay (5.25?mounting rack included).Works with USB-based ExpressCard devices including EVDO data cards, flash memory, flash card adapters, security, legacy I/O (PS2, serial, parallel), optical disk drives, GPS receivers, and more?