The electronic volume control module has an onboard 3W digital audio amplifier board with buttons for adjusting volume.

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Adjustable low-pass and high-pass filter, solderless, for high-power 400W KTV stage speakers.

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DIY lossless audio speaker system with 230W Bluetooth decoder, stereo amplifier board, color screen and recording/call function.

Miniature Bluetooth amplifier board with 250W high power stereo audio amplification module, compatible with USB flash drives, sound cards and remote controls.

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