Motorola 53727 earbud with push-to-talk microphone A single earbud lets you talk and listen without removing the radio from your belt. Fits either ear; the small microphone clips to a collar or sleeve. Press the PTT button to transmit. Compatibility Single-pin TalkAbout series; Spirit GT and Spirit GT+. Talkabout 270, 280, T289, T5100, T5200, T5300, T5320, T5400, T5410, T5420, T5600, T5620, T5700, T5720, T5800, T5820, T6200, T6210, T6220, T6250, T6300, T6320, T6400, T7200; FR50, FR60. PTT-only compatibility for FR50, FR60, T5100, T5200 and T5300.