The Kenwood KHS-33 is an in-line push and talk switch Microphone with a 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-33 ear set to work for both the left or right ear. The KHS33 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 PKT series radios only. Keeps your hands free as you listen to the conversation and with just a push of the button you can reply back. This single pin design is perfect for security, reception, warehouses and more.