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This 2pack DB9 male solderless breakout board converts standard 9pin RS232 serial ports into userfriendly screw terminals, prioritizing core RXD, TXD and GND (pins 235) connections. Toolfree wiring design and protective case ensure stable signal transmission and longterm reliability. Perfect for technicians and hobbyists working on industrial control systems, serial communication prototyping and equipment troubleshooting.