Listen Technologies LS-31-072 - Listen iDSP Essentials Level 2 Stationary RF System (72 MHz)The Listen Essentials Level 2 Stationary RF System expands on the capabilities of our most basic system by expanding the range to cover up to 305 meters (1,000ft) affordably. The included transmitter features universal inputs compatible with most audio sources, and the choice of three (3) broadcast frequencies makes it easier to set up and fine tune. Digital tuning ensures that the included receivers won't drift off channel, guaranteeing a strong