Karaoke Preamplifier Board Microphone Amplification and Reverb Effect Board Volume Control Pre-Amplifier Board Module Supports computer software settings; once debugged, can be downloaded and saved to the chip.Various sound effects: hall/room, delay, pitch shift, voice changer, metal, electronic, wah, chorus, etc.Various EQ parameters, bass boost, 3D stereo widener, harmonic exciter, bandpass filter, low-pass/high-pass filter, notch filter, etc.Gain adjustment, noise reduction, AGC, compression, anti-feedback, frequency shift, vocal cancellation, etc.Built-in wide-voltage DC/DC buck-boost circuit;Reverse polarity protection; Silent power-on/off circuit, virtually no popping sound during power-on and power-off;Operating voltage: DC9V-40V;Power consumption: 1.6W;USB interface: Type-CNOTE: Software download, please contact customer service.Color: GreenMaterial: PCBPackage Contents:1 * Preamplifier Board1 set of accessoriesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.