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Working Voltage 3V ~ 5V; Max Output Power: 3W+3W; Efficiency: 90% Potentiometer with switch, can adjust the volume and control the power switch Can use USB port on computers to offer 5V power supply for the amplifier board Note:Without reversed connection protection, meaning the module will burn if wires are connected reversely; Make sure the power supply is not more than 5.5V; Please note that do NOT connect to power if you do have the speaker connected, or will wreck the module Package Content:6 x PAM8403 3W+3W Digital Power Amplifier Board, 6 x Knob Cap, 3 x 3.5mm Audio Jack Cable