Item Name: Stereo Digital Mini Audio Module Amplifier Board Mini PAM8403 D 2*3W USB Power. Description A class, B class amplifier such efficiency is only about 30%or using a mobile phone charger USB port 5V power supplySpeaker With:4-8ohms recommended:4 ohmsD class amplifier efficiency is extremely high, not because of temperature affect the sound qualityModule has a short-circuit current protection and over-temperature protectionNoise canceling circuit was built in the amplifier boardD class amplifier is highly respected todaySize:As the picture shownOperating voltage: 2.5V-5.5VPower on / off without pop noiseCan use the computer USB port 5V power supplyBut do not add heat sink and take less spaceHigh efficiency:90%Battery power can also be usedCan provide 3W (left channel) +3 W (right channel) output power in the 4 load and 5V power supply
