This is a headset of motorcycles, bicycles, ATV's for Motorola radios with 2 PIN connector.

This one is for Half face helmet

Twin right angle: Ear 2.5mm stereo (top pin). Mic 3.5mm stereo (bottom pin).
Spaced Between Two Pin: 4mm
Compatible Ham Radio Model:
Motorola VHF / UHF Spirit, Spirit Pro, Spirit Pro+
Motorola Spirt Series: SV10, SV11, SV11D, SV21, SV12, SV22, SV22C, SU210, SU22, SU22C, SU220
XTN Series: XTN446, XTN500, XTN600
XTN XV Series: XV1100 XV2100 XV2600
XTN XU Series: XU1100 XU2100 XU2600
CLS Series: CLS1110, CLS1410, CLS1413, CLS1450, CLS1450C
Spirit M Series: MV11, MV11CV, MV12, MV12CV, MV21C, MV21CV, MV22, MV22CV, MU11, MU11C, MU11CV, MU12, MU12C, MU12CV, MU21C, MU21CV, MU22CVS, MU24CV, MU24CVS, MU24CVST
CP Series: CP88, CP100, CP150, CP200 VHF / UHF
GP Series: GP2000, GP2100, GP300, GP 308, GP68, GP88, GP88S
SP Series: SP10, SP21, SP50
CT Series: CT150, CT250, CT450, CT450LS
PRO Series: PRO1150, PRO2150, PRO3150
P Series: P040, P080, P100, P110, P1225
Other Series: GTI, GTX, LTS2000, VL50, VL130, PMR446, ECP100