Cost-effective way of converting a straight through cable into a null modem cableThe NM9FF Null Modem Adapter features two DB9 female connectors - a cost-saving way to convert a straight through cable into a null modem cableThe DB9F Null modem cable adapter is backed by lifetime warranty and free lifetime technical supportThe StarTech Advantage- Converts a straight through serial cable in to a null modem cable- Easy to use and install- Backed by StarTech lifetime warranty