ITEM NAME:PAM8403 Audio Module USB DC 5V Class D digital amplifier Amplifier Board LC Q6X8 PAM8403 Audio Module USB DC 5V Class D digital amplifier Amplifier Board LC Q6X8 Color: Green Can using the computer USB port 5V power supply or with a mobile phone charger USB interface 5V power supply Can provide 3W (left channel) 3 W (right channel) output power at 4ÃŽ © load and 5V supply voltage.Noise reduction circuit in the Amplifier board built. A-Class, B-Class Amplifier efficiency as only about 30%. Class D Amplifier is now highly respected. 1 x Amplifier Board. Module comprises a short-circuit current protection and over temperature protection.