Mini Digital Power Amplifier Board 2*3W Class D Audio Module USB DC 5V PAM8403<br>Feature:<br>Can use the computer USB port 5V power supply or using a mobile phone charger USB port 5V power supplyBattery power can also be usedHigh efficiency: 90%Can provide 3W (left channel) + 3W (right channel) output power in the 4&amp;Omega; load and 5V power supply conditionsA class， B class amplifier such efficiency is only about 30%D class amplifier is highly respected todayD class amplifier efficiency is extremely high， not because of temperature affect the sound qualityBut do not add heat sink and take less space noise cancelling circuit was built in the amplifier boardPower on \/ off without pop noiseModule has a short-circuit current protection and over-temperature protection<br>Specification:<br>Operating Voltage: 2.5V ~ 5.5VSpeaker With: 4Ohm ~ 8Ohm (recommended: 4Ohm)Speaker Power: 2W ~ 8WSize: 21 x 18 x 3.4mm (L x W x H)Net Weight: 1g<br>Application:<br>LCD TVs， monitorsLaptopPortable SpeakersPortable DVD players， game consolesPhone \/ speakerphone<br>Note:<br>First turn OFF and then powered speakers ， or likely to cause damage to the chip;Because digital volume control module has a great gain ， so do not let too much leaving the audio signal input signal cut limiter.<br>Package included:<br>1 x Mini Amplifier Board