RM: RMU2040, RMU2043, RMM2050, RMU2080, RMU2080, RMV2080. Arrowmax ASK0425-M1 Earpiece w/Mic Compatible with Motorola CP200D CP100D R2 DEP450 BPR40D CP200 CP185 BPR40 CLS1410 CLS1110 DTR700 DTR650 RDU4100 RDU4160D RMU2040 RMU2080D CLS Single Wire Surveillance Headset.
eBay