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This 10-pack DB9 RS232 serial gender changer set includes male-to-male and female-to-female 9-pin couplers to extend and convert standard serial interfaces. Built with solid metal shielding and precise pin contacts, it ensures stable anti-interference signal transmission for industrial controllers, POS machines, PLC equipment, serial scanners and monitoring devices. Mini lightweight design fits narrow equipment space without extra bulky space occupation, plug and play without driver installation. Widely applicable for all devices equipped with standard DB9 RS232 serial ports, perfect for factory automation, retail cash registers, laboratory testing and serial equipment wiring transformation.