This Ericsson hands free ear bud is a one piece unit that combines an ear piece and a microphone built into the same cord. Microphone is located about 10 to 12 inches below the ear piece such that with the ear bud plugged into the ear, microphone rests comfortably close to the user's mouth. Just plug the cord into the headset jack of your phone, slip the ear bud into your ear and you're set to go hands free. It comes with a clip which you can use to either attach the microphone to your shirt or let it hang freely.