Color: Red Quantity: 1 Material: Circuit board Voltage: DC 2.5~5.5V Output power: 3W + 3W (at 4ohm) Noise ratio: 90dB Efficiency: More than 90% 2 channels 3W amplifier with PAM8403. Output is CMOS BTL driver Cannot change any component parameters to protect IC The board can also powered by 5V USB power supply or 4 x 1.5V batteries It is perfect for MP3/MP4/notebook
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