TENQ&reg; 2 Pin Two Way Radio Earpiece Acoustic Tube Headset for Kenwood HYT BAOFENG BF-UV5R 888S Retevis H-777 (1 Pack) Length of the cable (Plug to PTT): 100cm Length of the cable (PTT to Speaker):108cm Two-pin standard diameter: Ear 3.5mm stereo (top pin) Mic 2.5mm stereo (bottom pin);Space of two-pin: 11mm Soft plastic earbud fits comfortably in your ear with a transparent acoustic tube which keeps your conversations private