Features: This power amplifier uses power supply, and the power supply is 12V-32V. Choose the power supply such as 24V, 10A, and 32V Choose the appropriate power supply according to your own horn power. The total power of the power supply is 20% than the total power of the loudspeaker. For example, connecting two speakers is 80W. The total power of this loudspeaker is 160w. To choose the power supply, you can choose 32V/7A or 24V/10A. Double channel parallel shielding sound frequency inductance loss is smaller and more balanced. Suitable for audiophiles, car sound enthusiasts, and needing power amplification in space constrained installations like vehicle sound or home theater builds. Suitable for car loudspeaker, computer loudspeaker, home loudspeaker, other occasions to meet the need of different users. Specifications: Component:Plastic Type:G08/G09/10 Input: 12v-32v Output power:120W+120W Chip: tpa3221 Size: Approx.6.7x10.9cm/2.64x4.29inch Package Includes: 1 Set Power Amplifier Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.