The 72.9 MHz receiver by Peavey has an operating frequency of 72. MHz Frequency stability is controlled by a phase locked loop synthesizer. Receiver provides a 3.5 mm headphone output jack mounted on the top panel for the placement of included earbuds. This assisted listening receiver is powered by two AA batteries, not included. Receiver has an OFF/ON/VOLUME control mounted on the top panel. Peavey item 03010590.