Aike&reg; 2 pin PTT MIC Covert Acoustic Tube In-ear Earpiece Headset for Motorola Radio GP300,GP308,GP68,GP88,GP88S A remote microphone with push to talk button you can clip anywhere The transparent tube connecting the ear bud makes you look like a secret service agent or a body guard and protects you from radiation The earbud/speaker fits snugly to ear, which keeps your conversations private Two-pin standard diameter: Ear 2.5mm stereo (top pin). Mic 3.5mm stereo (bottom pin). Space of two-pin: 8mm