... , sales improvement, etc..2.with digital reverberation function, 6 super band equalizer: POP,ROCK,CLASSIC,JAZZ,BASS,FLAT..3.with 4.3inch ... ±3dB5: 4.3inch TFT HD corlorful LCD screen6:Power supply: 7.4V 2200mA7:Amplifier size: 138*55*105mm8:Microphone sensitivity :-53 ...