Open/Half Face Motorcycle Bike Helmet Earpiece Headset Mic Microphone for 1-pin Motorola Talkabout Cobra Radio Open/Half Face Motorcycle Bike Helmet Earpiece Headset Mic Microphone for Motorola Talkabout Radio Walkie Talkie Security Door Supervisor 1pin. Designed to work with moto/bike racing helmet. Noise cancelling with boom mic microphone. Dual speakers with sticker, can be pasted to inside of the helmet. PTT button with velcro which can be fixed to handlebar is convenient to use. Compatible with two way radios walkie talkie that required Motorola 1 pin plug. Including COBRA MT200, MT400, MT550, MT600, MT750, MT800, MT850, MT900, MT975 Motorola TLKR T3, T5, T6, T7, T8, T9, T80 Extreme, PMR446, XTR446, XTL446, Motorola Talkabout: T5022, T5412, T5422, T5522, T5532, T5622, T270, T280, T289, T4000, T6000, T7000, T8000, T9000, T4800, T4900, T5000, T5100, T5146, T5200, T5300, T5320, T5400, T5410, T5420, T5500, T5512, T5550, T5600, T5620, T5700, T5710, T5720, T5725, T5800, T5820, T5900, T5920, T5950, T6200, T6210, T6220, T6222, T6250, T6300, T6310, T6320,T6400, T6500, T6510, T6550, T7100, T7150, T7200, T7400, T7450,T8500, T8550, T9500, T9550, T9500R, T9500XLR, T9550XLR, T9580XLR, T9650, T9680, SX500, SX620R, SX700, SX709R, SX750, SX800, SX900, SX920R, FV200, FV300, FV500, FV600, FV700, FV750, FV800, EM1000, EM100R, EM1020R