1.As serial cable gender changers : change the gender on D-type port of RS-232 cable; 2.As DB9 Extender for Extended Distance Use: couple two cable together to get a longer one; 3.Sturdy DB9 adapter is wired straight through (NOT Null-Modem-Adapter). What’s Included: 1x 9 pin female to female adapter F-F 1x 9 pin male to female adapter M-F 1x 9 pin male to male adapter M-M If you are working in the serial communications domain, The 3 combos 9 pin gender changer is ideal to make the coupling connection when running data cables. RS232 male to male gender changer M/M converts DB9 female to DB9 male plug; RS232 male to female connector M/F is used as a port saver or to connect existing cables together RS232 female to female mini gender bender F/F converts DB9 male to DB9 female socket. 3pcs D-SUB serial gender changer adapter to save yourself the cost and hassle of buying a new cable by just changing the gender of the port and using the cable you already have. RS232 male to male adapter with small body is convenient for carrying and storing in your RS-232 toolkit, also the perfect PC accessories connectors for most serial devices where space is limited. DB-9 gender changer is compatible with devices that requires COM port connection: controlling computer, digital machine, PDA, commercial cashier, thermal label printer, rs232 splitter, serial port card, server, marine vessels, network device, telescope, radio, old Cisco router, transceiver, industrial automotive instruments,etc. Applications: Join 2 serial adapters cables together Got a connector for OBDII cable, RJ45 console cables, modem cables, computer cables, DTE or DCE devices, FTDI serial to USB adapter, etc. Connectors: two rows 9 holes DB-9 female and 9 pin male RS232 adapter is used for serial data, NOT for 15 prong VGA connection.