This is a keylogger based on PIC12F675 with 64K eeprom (24LC512). When keylogger is connected between PC and keyboard it will record every keypress to memory. By pressing a button recorded data will be sent back to PC so user can read it. No need of spesial software on PC, notepad is enough.
There's eeprom on the left side and PIC on the right, very simple.
Keylogger with case on it, connected to my PC. It could be much smaller if there was SMD components in it.
Schematic diagram
