Package: 2pcs DB9 breakout board connector.(female). The breakout board can be used for automatic control equipment, industrial control equipment, cash register, tax control machine, computer, etc. The wire board is printed with wire number which is convenient for quick wiring. Simple and quick connections installation. These adapter boards can be mounted directly to the equipment without using extension cables. Used for experimentation or prototype work with RS-232 serial ports, I/O cards, and any other device that uses a DB9 connector. This breakout adapter is solderless. No soldering or crimping required.