product description Includes an onboard audio power amplifier LM386M. High-precision adjustable resistance (0-3.3V, 2 channels) for adjusting the input voltage level. With speaker for indicating volume (1 channel) output voltage level. Support MP3 output, music player and so on Ideal for testing the AD / DA functions integrated in the MCU -speaker, - High precision adjustable resistor - 2 - Analog input / output
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