HKLN4599 HKLN4599B Original Motorola D-Style Earpiece with In-Line Microphone and PTT, replaces 56517 56517F Compatible w/ CLS1110, CLS1410, DLR1020, DLR1060, XV1100, XV2100, XV2600, XU1100, XU2100, XU2600, DTR410, DTR550, DTR650, RDV2020, RDV2080d, RDV5100, RDU2020, RDU2080D, RDU4100, RDU4160D, RMU2040, RMU2080, RMU2080D, RMM2050, RMV2080, AUX, Series,VLB Series XTN Series, M-Series and AX Series. Updated versions of the 56517 56517F Comfortable for extended wear, this compact and durable accessory allows users to receive communication discreetly. This d-style earpiece has an in-line microphone and push-to-talk button for convenient and quick radio access while on the go.