nemozone

“Hardware keyloggers are used for keystroke logging, a method of capturing and recording computer users' keystrokes, including sensitive passwords.[1] They can be implemented via BIOS-level firmware, or alternatively, via a device plugged inline between a computer keyboard and a computer. They log all keyboard activity to their internal memory…”

Source https://wikiless.org/wiki/Hardware_keylogger?lang=en

Further reading https://www.irongeek.com/i.php?page=security/usb-hardware-keyloggers-1-keycarbon