ITEM NAME:TPA3116D2 Subwoofer DC8-25V Digital Power Amplifier Board TPA3116 Audio Module Product Description Description: Specifications: Power range: DC8-25V Number of channels: mono (subwoofer output) Output power: 100W Turn the knob to the bottom to turn it off PCB size: 75 * 60 * 20mm/2.95*2.36*0.78'' Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding. Included: 1 X TPA3116D2 Subwoofer Digital Power Amplifier Board.Included: 1 X TPA3116D2 Subwoofer Digital Power Amplifier Board. Number of channels: mono (subwoofer output). Due to the different display and different light, the picture may not show the actual color of the item.