SODIAL(R) AC/DC 9V-15V/12V 15W+15W TDA7297 Version B Dual Channel Amplifier Board Module Dimension: 50x50x42mm (length x width x height, excluding potentiometer handle), ultra-small size suitable for any space. Voltage: DC 9-15V, recommended DC voltage 12V, current 2A above Power: 15W +15 W Output Impedance :4-8 Upgraded version of the radiator, wider and thicker, better cooling effect