abcGoodefg&reg; FBI Covert Acoustic Tube Earpiece Headset PTT Mic for Motorola Two Way Radio Device Walkie Talkie GP88 300 2000 CT150 P040 PRO1150 SP10 XTN500 2pin Two-pin standard diameter: Ear 2.5mm stereo (top pin). Mic 3.5mm stereo (bottom pin);Space of two-pin: 8mm Ear bud style headset with built-in line microphone;Covert acoustic tube transmits more clear sound Transparent tube SPK has excellent concealment which makes communication more private Super Quality,more stubborn and durable;Big size PTT, wearing gloves does not affect the key operation;Hidden microphone is located in the side of PTT switch Notice: If your radio model not listed above, please email us your model number, we will help you find one that suit for you