Digitally controlled sound system, control panel with microphone + system unit. The unit features a 40 W/100-70 V amplifier and 4 ohm, 4 inputs: Control panel, Mic, Line, Music, configurable priority, configurable output (music, announcements, both), 1 W/8 ohm output, relay for forced listening, cascading connection up to 16 BA1040 units.