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Features: The PT2399 microphone amplifier board is processed by a professional manufacturer, with stable performance and long service life Excellent performance: Using this single channel amplifier board, the sound quality is very good High quality: The microphone reverberation board uses high-quality electronic components and power amplifier chips Note: PT2399 microphone reverberation board is a single-channel microphone reverberation board Working voltage: Single-channel microphone reverberation board is powered by DC6-15V, wide power supply voltage