The drive will "auto-lock" everytime you remove it from a computer, requiring you to key in your PIN number on the simple touch-pad interface.
The Flash Padlock comes in two capacities, 1 and 2GB with pricing of $29.99 and $39.99 USD respectively.
For full details you can read up on Corsair's official announcement here, or head straight to the product page folks.

Fremont, CA, August 16, 2007 - CorsairĀ® www.corsair.com, a worldwide leader in high performance computer and flash memory products, today launched the "Flash Padlock" family of affordable USB 2.0 drives, the safest way to secure your data while on the go. Priced starting at only $29.99, the Flash Padlock line of affordable USB 2.0 flash drives address the need for secure data storage through hardware technology, rather than software. Flash Padlock features "Auto-Locking," so the user doesn't need to remember to enable the protective feature -- It will automatically lock and protect itself after removal from the computer.
With its simple touch-pad security PIN entry system, Flash Padlock can be unlocked quickly and confidentially for use as a standard USB flash data drive. Flash Padlock is impervious to "brute force" hacks or keystroke loggers that would defeat a software secured USB flash drive.