Four EQ modes for maximum flexibility
The A1 provides Flat, Bass1, Bass2 and Bass3 EQ modes, switchable simply by briefly pressing the power button, allowing you to best adapt the sound output to your earphones and your ears; moreover the indicator light clearly indicates the present EQ mode.
Blue LED on continuously: Flat EQ
Blue LED flashing once every 2 seconds: Bass1 EQ
Blue LED flashing twice every 2 seconds: Bass2 EQ
Blue LED flashing thrice every 2 seconds: Bass3 EQ