The Williams Sound PPA R35-8 FM receiver can operate up to eight channels simultaneously when used with any Williams Sound Personal PA transmitter operating on the 72-76 MHz bandwidth. The PPA R35-8 features crystal clear audio, and is digitally synthesized for stable tuning. Each unit is built in a rugged impact-resistant case, and and will operate up to 50 long-lasting hours on two AA alkaline batteries (not included). It also features an integral volume on/off control, LED power and low battery indicator, channel selection knob and earphone jack.