Tripp Lite Null Modem Serial RS232 Cable (DB9 F/F) 6-ft. (P450-006) Gold Null Modem Cable (DB9 F/F)- 6 Feet Premium double shielding minimizes line noise interference 24K gold-plated DB9 connectors assure error-free signal transfer Broad compatibility with PCs and Macs Lifetime warranty 6-ft. Null Modem Gold Cable (DB9 F/F) Superior molded cables with integral strain relief and foil-shielding for maximum EMI/RFI protection Gold-plated connectors provide superior conductivity Null modem cables connect two serial devices that require a null modem configuration Lifetime Warranty