Motorola RMN4049 Noise Cancelling Temple Transducer.  I.S. (FM intrinsic safety standard).

Temple transducers ulitize a bone conduction receive method by converting audio into sound vibrations which are transmitted to the inner ear.  The receiver rests on the temples and transmits the vibrations via the surrounding tissue and bone so the user can receive audio without covering the ear.   

Includes lightweight headset, temple transducer (dual muff - binaural), noise canceling boom mic, and in-line push-to-touch (PTT). 

Compatibile with the XTS 2500/ 3000/ 5000, HT1000, EFJ 5100 portable two-way radios.