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This DB9 RS232 to RJ45 extender kit comes with 2 pieces, supporting both male and female 9-pin serial port conversion. It allows you to use common CAT5 or CAT6 Ethernet LAN cables to extend RS232 serial signals conveniently. Built with reliable internal wiring and shielding structure, it effectively resists external interference and maintains stable long-distance serial communication. Plug and play design saves installation time, no soldering or complicated setup needed. Perfect for industrial control, equipment debugging, POS systems, serial device remote extension and all RS232 networking wiring scenarios.