This 2pack DB9 female solderless breakout board converts standard 9pin RS232 serial ports to easytouse screw terminals, focusing on core RXD, TXD and GND (pins 235) connections. Equipped with a protective case, it delivers stable signal transmission and easy wiring without soldering. Ideal for technicians and hobbyists working on industrial automation, PLC debugging, legacy serialdevice maintenance and custom serial communication projects.