Info:32.8ft/10m black 9 pins RS-232 female DB9 to male DB9 2-3 null modem/rollover/crossover Serial Cable Adapter | Pin-Out: 1-1 / 2-3 / 3-2 / 4-4 / 5-5 / 6-6 / 7-7 / 8-8 / 9-9 / G-G. This is a null modem serial cable. | Plug and Play:No need to install driver; very easy and quick connection. Adopted high quality copper and fully shielded to prevent unwanted EMI/RFI interference, so as to ensure the stable & high speed date transmission. | After-Sales-Service: Please contact us if you need any support about our products. supports 30 days free return and 180 days services.