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This DB9 female to female gender changer is designed for RS-232 serial port connection and cable extension. It adopts standard 9-pin pin assignment to ensure perfect compatibility with DB9 serial devices. Made with premium conductive terminals for stable signal transmission and excellent anti-oxidation performance. Mini lightweight structure allows flexible installation in narrow spaces, plug and play without extra tools. Ideal for industrial control equipment, PLC, serial printers, POS systems and all kinds of DB9 RS232 serial wiring applications.