4Pack 2Pin Clip-on Covert Acoustic Tube earpiece compatible with 2-pin Motorola radio devices.Two-pin standard diameter ear 2.5mm and 3.5mm stereo;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. Metel Clip and PTT and the microphone provided real hands free; Easy to press and keep your communication private Compatibility:For the following Motorola portable two way radios: XTN Series: XTN446,XTN500, XTN600 .XTN XV Series: XV1100,XV2100, XV2600, XV4100.XTN XU Series: XU1100,XU2100, XU2600, XU4100 .XTN AX Series: AXV5100, AXU4100.CLS Series: CLS1110,CLS1413, CLS1450, CLS1450C, CLS1450CB, VL50 .Motorola Spirit Series: SV10, SV11, SV11D, SV21, SV12, SV22, SV22C, SU210, SU22, SU22C, SU220 VHF / UHF Spirit, Spirit Pro, Spirit Pro+, Spirit HP 10 .Spirit MU Series: MU11, MU11C, MU11CV, MU12, MU12C, MU12CV, MU21C, MU21CV, MU22CVS, MU24CV, MU24CVS, MU24CVST Notice: if the sound quality for receiving starts to get fuzzy,please disconnect the clear tube earpiece and blow it out with an air in a can,because the air in the tube will effect the transmission.If you clear the tube earpiece and the issue still not solve ,please contact with us. Compatibility:For the following Motorola portable two way radios: Spirit MV Series: MV11, MV11C, MV11CV, MV12, MV12CV, MV21C, MV21CV, MV22CV, MV24CVS CP Series: CP88, CP040. CP100, CP110, CP125, CP150, CP200, CP250, CP300 GP Series: GP2000 , GP2100, GP300, GP308, GP68, GP88, GP88S SP Series: SP10, SP21, SP50+, SP50 CT Series: CT150, CT250, CT450, CT450LS PRO Series: PRO1150, PRO2150, PRO3150 P Series: P040, P080, P1225, P1225LS DTR Series: DTR410, DTR550, DTR610, DTR650 Other Series: GTX, LTS2000, VL130, PMR446, ECP100, Mag One BPR400, EP450, AU1200, AV1200 RDX Series: RDV-5100, RDV2020, RDU2020, RDU2080DD, RDU4100, RDU4160D, RDV2080D, RDV5100 FDC: FD-150A, FD-450A, FD-160A, FD-460A Bl