StarTech.com Cross Wired DB9 Serial Null Modem Cable - F/F - Serial/Null Modem Cable - 1 x DB-9, 1 x DB-9 - Serial/Null Modem Cable Crossover External - 25 ftThis 25ft Cross Wired Serial Null Modem Cable features two DB9 female connectors, allowing you to connect a 9 pin serial port to a serial port, or transfer files from PC to PC via serial connection. Designed to provide a reliable, long lasting connection, this serial null modem cable is backed by StarTech. com's lifetime warranty. Backed by StarTech. com's lifetime warranty Connect a 9 pin serial port to a serial printer Easy to use and install