The Kenwood KHS-23 is a 2 wire microphone/ear bud. The microphone, with PTT button, clips to a shirt while the small Ear bud that rests comfortably in your ear. When connected, the microphone and speaker will disable the similar functions in your radio. Kenwood has made the KHS-23 ear set to work for both the left or right ear. The two wire KHS-23 has a Clip Microphone With Ear bud. The Push-To-Talk (PTT) button on the microphone is easy to use. This ear bud with clip on microphone works with ProTalk and FreeTalk series radios. Keeps your hands free as you listen to the conversation and with just a push of the button you can reply back. This two wire design is perfect for security. Kenwood USA is a leading developer and manufacturer of consumer electronics and communications equipment. Founded in the United States in 1961, Kenwood USA is the largest sales subsidiary of Kenwood Corporation of Japan and is recognized by consumers and industry professionals for providing products known for quality, performance, and value.