Item Name: Stereo Channel Mini Amplifier Board Audio Module D 2*3W USB Power Mini PAM8403. Can use the computer USB port 5V power supplyColor:As the picture shownA class, B class amplifier such efficiency is only about 30%LCD TVs,monitorsD class amplifier is highly respected todaySize:As the picture shownor using a mobile phone charger USB port 5V power supplyHigh efficiency:90%Portable SpeakersLaptopCan provide 3W (left channel) +3 W (right channel) output power in the 4 load and 5V power supply
