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The left and right channel output of "negative" cannot be connected together, otherwise it will burn the IC. Connect the speaker (load) and then powered. Product Description:Name: PAM8403 Mini Digital Power Amplifier Board Class D 2*3W 2.5-5V inputModel: PAM8403Super Mini: 1.85*2.15cmInput voltage: 2.5-5V (can't be more than 5.5V, otherwise it will burn the ICs on board)It could work with 4 Ohm and 8 ohm Speaker.Output power: 2 channels *3W