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POWER SWITCH: Press to switch amplifier on. 2. FM ANTENNA BOOSTER SWITCH: Press the switch to improve FM reception. The switch works independently even when power switch off. 3. HOLD SWITCH: Press the switch to light up all the LED indicator built in the shaft of slide equalizer control. (Scan/Level switch at "SCAN" position). 4. SCAN/LEVEL SWITCH: When switch set at "SCAN" position, the LEOs built in each slide control scan automatically from left to right over each frequency points. (Hold swit