Convert a DB9 male connection to a DB9 female connection; use for serial applications. Connector 1: (1) DB9 Female Connector 2: (1) DB9 Female. These DB9 female to female adapters allow file transfer between two computers or other devices. Connect two DTE or DCE devices with no conflict in data transmission,crossed receive and transmit conductors. Lifetime warranty and customer service.Just contact us if you encounter ANY issue and well make it right.