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ZK-MT21 is a 2.1 channel Bluetooth power amplifier board integrating wireless audio receiving and power amplification functions. It delivers separate stereo sound and independent subwoofer channel to build a complete bass audio system. The onboard adjustable knob allows flexible tuning of bass intensity according to different speakers. With reliable Bluetooth 5.0 compatible transmission, it supports lossless audio playback without tangled audio cables. Suitable for modifying desktop speakers, vehicle audio equipment and homemade small home theater sound boxes. Power supply, speakers and subwoofer are not included.