Peltor 7000039629 MT Series In-Line PTT Adapter, For Use With 3M Peltor Protective Communication Headsets, Baofeng, Bendix King/Relm, HYT, Hytera, PR4G, Puxing, Wouxun, Kenwood TK3101/TK250/350 Funkey Communication Radios and 2-Way Radios, AA Battery