Williams Sound PFM PRO Personal FM Listening System; 17 selectable channels; 72-76 MHz operating frequencies; FM signal, compression, mute control; Operates up to 150' (46 m) 17 selectable channels, 72-76 MHz operating frequencies Auxiliary input - broadcast any audio source FM signal, compression, mute control; Operates up to 150 (46 m) Improves listening for individuals or groups Includes: (1) PPA T46 FM Body-pack Transmitter, (1) PPA R37 FM Body-pack Receiver, (1) EAR 041 Single Mini Earphone, (1) HED 021 Folding Headphone, (1) WCA 087 Audio Input Cable, (1) MIC 090 Lavalier Microphone, (2) BAT 001-2 AA Alkaline Batteries and (1) CCS 043 System Carry Case