Item Name: Channel Digital Mini PAM8403 Amplifier Board D 2*3W USB Power Audio Module. D class amplifier efficiency is extremely high, not because of temperature affect the sound qualityA class, B class amplifier such efficiency is only about 30%Color:As the picture shownSize:As the picture shownCan use the computer USB port 5V power supplyModule has a short-circuit current protection and over-temperature protectionHigh efficiency:90%Can provide 3W (left channel) +3 W (right channel) output power in the 4 load and 5V power supply
