This 79" universal smart headset connection cord with its eight-position slide adjustment lets you connect just about any headset to virtually any single or multiline phone. Standard cords connecting phones and headsets are anything but standard, as each phone maker has their own wiring code. This cord nicely solves this problem. With no user manual needed, you just slide the eight-position adjustment switch until you hear a dial tone. Smart cord also includes a low-current microphone amplifier to provide perfect operation with phones that require extra signal gain, such as Cisco, Panasonic, Nortel and Avaya, plus many IP phones.