This adapter converts the proprietary 4 conductor Tungsten C/W Jack to a 3.5mm standard split-mono headphone jack and includes a built-in microphone and answer button. The perfect hands-free solution for the car. We chose a particular mic that is designed to work at 1.5 - 2 feet. The Tungsten C/W is a mono device, but we have split the mono channel to both left and right channels, so that you receive mono sound in both ears. The adapter cable is approximately 6" long.