With Retevis R-312 Remote Speaker with Push-to-Talk Microphone, you can talk on your two-way radio hands free. Just clip it to your lapel, click the push-to-talk (PTT) button and speak into the device.Space of two-pin: 0.31 inch(8mm)length of short pin:0.47 inch(12mm) Compatible for Motorola:GP Series:GP2000, GP2100, GP300, GP 308, GP68, GP88, GP88SCP Series: CP88, CP100, CP150, CP200SP Series: SP10, SP21, SP50CT Series: CT150, CT250, CT450, CT450LSPRO Series: PRO1150, PRO2150, PRO3150P Series: P040, P080, P100, P110, P1225, 1225LS,2000XTN Series: XTN446, XTN500, XTN600XTN XV Series: XV1100,XV2100,XV2600XTN XU Series: XU1100,XU2100,XU2600CLS Series: CLS1110, CLS1410, CLS1413, CLS1450, CLS1450CSpirit M Series: MV11, MV11CV, MV12, MV12CV, MV21C, MV21CV, MV22, MV22CV, MU11, MU11C, MU11CV, MU12, MU12C, MU12CV, MU21C, MU21CV, MU22CVS, MU24CV, MU24CVS, MU24CVSTMotorola Spirt Series: SV10, SV11, SV11D, SV21, SV12, SV22, SV22C, SU210, SU22, SU22C, SU220Other Series: GTI, GTX, LTS2000, VL50, VL130, PMR446, ECP100, PR400Compatible for HYT:TC-500,TC-600,TC-700,TC-610,TC-620,TC-2110,TC-1600,TC-510Package includes:10 x R-312 Mini PTT Mic For Moto/HYT Radio