KeyCobra - The next generation hardware keylogger
Keycobra is one of my most favorite hardware keyloggers as it offers more than 2G of storage,This keystroke recorder comes in a standard version - 4MB memory capacity, 2,000,000 keystrokes (over 1,000 pages of text), and a Venom version 2 billion keystrokes (over 1 million pages of text), organized into an advanced flash FAT file system. It is compatible with all three operating systems windows,linux and Mac OS, Here are some features of hardware keylogger due to which keycobra is one of the most popular hardware keyloggers around.
FeaturesAnd much more
Here is an screen shot of logs captured by keycobra as it has capturedkeystrokes for chat.
KEYCOBRA - Next Generation hardware keylogger