High quality shielded 2 metre long straight-through 9-pin DB serial port computer cable lead.
DB 9-pin MALE plug one end and a DB 9-pin FEMALE socket the other. Wired straight-through i.e. Pin 1 to Pin 1 through Pin 9 to Pin 9.
Used by various RS232 equipped electronic kits, modules and other devices to connect them up to your computer, laptop, etc.