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PAM8403 5V 2-Channel USB Power Audio Amplifier Board 3W*2 Volume
Operating voltage: 2.5V-5.5V Maximum output power: 3W x 2(5V 4ohms) PCB size : Length: 29mm Width: 20mm Note: please make sure the power supply is not more than 5.5V and please don't do reverse polarity for "+" and "-"£¬ or else£¬ it will burn the board.