The 53815 lightweight headset with boom microphone rests on the back of the head for a comfortable fit.  When used with certain Motorola Business Radios, the headset is voice activated.

Compatible with all Motorola Business Radios: CLS1110, CLS1410, XV1100, XV2100, XV2600, XU1100, XU2100, XU2600, DTR410, DTR550, DTR650, RDV2020, RDV2080d, RDV5100, RDU2020, RDU2080D, RDU4100, RDU4160D, M-Series and AX Series

CLS1110 and XU1100 Motorola two way radios are not capable of voice activation.