The commercial (public address) power amplifier has a 6-zone speaker output with individual volume control Two phantom-powered mic inputs make using condenser microphones convenient Versatile inputs with RCA, 3 mic inputs with 1 priority mic input on the front, Optical (SPDIF) input, USB input, FM radio tuner, FM antenna and Bluetooth for easy connection to audio streaming devices; each mic has repeat, speed, echo control Built-in clipping limiter and reliable cooling system protect your speakers and amplifiers from overheating The audio amplifier is ideal for multi-room applications or broadcasting systems such as restaurants, lounges, bars, pubs, schools and warehouses