Swivel Earpiece & In-Line Microphone With Push To Talk Button, Ergonomic Earpiece Sits Over The Ear & Adjustable Rotating Joint Allows Use On Either Ear For Greater Comfort When Worn For Extended Periods, Flexible, Plastic Joints Allow Users To Adjust To Fit Any Ear Size, Ideal For Use In Noisy Areas Or Where Privacy From Nearby Personnel Is Desired, Fits Motorola CLS, RD, DLR, DTR, XTN, AX, M Series Business Two Way Radios, Replaces RLN6423.