public address system mixing amplifier feature: 2 lines, 3 MIC input, with individual volume control. MIC1 prior to other inputs With individual bass and treble control Intelligent overheating and automatic short-circuit protection One bra-graph LED indicator to show working status Power output terminals with back cover for safety This amplifier with power of 80W, 150W, 250W, 350W, 450W and 650W for selection.