●The DB9 gender changer converts a DB9 9-pin male connector into a DB9 9-pin female connector and will work with any serial devices. ●The serial DB-9 (9 pin) Male Gender Changer. 9 way Male / Male Connectors, 9 Pin Serial RS232 gender Changer. ●Gold contact plating provides reliable connections with repeated mating cycles ,Screws are removable and reversible ●DB9 Null Modem Adapter can be used with POS ,PC, modem, scanner, printer,cashier, machine and more DB9 serial communication equipment. ●You will get 2-year warranty once you buy our DB9 gender changer male to female.