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DC power supply is designed to supply power directly available 12V battery voltage range: 9-15V, recommended voltage 12V, output power up to 15W + 15W, the peak power of 30W + 30W, the sound volume is small but super shock for any occasion. Sound quality is super good - treble delicate, soft, transparent, no harsh; bass strong, full, strong, and acting freely. Size: 50x50x42mm (length x width x height, without potentiometer handle), ultra-small size for any space. The power amplifier board is imported TDA7297 two-channel amplifier chip. No current impact sound boot, high fidelity no static noise!