1. TPA3116D2 digital power amplifier board, dual channel, high power, shocking volume 2. The input voltage is DC12-28V, DC24V is recommended onboard operational amplifier chip TL074C, 3. After the audio source is input, it first enters the operational amplifier chip for amplification, and then enters the power amplifier chip to make the volume more shocking. Type:voltage regulator Channels:2 (2.0), 2 channels Product name:xh-m543 tpa3116D2 power amplifier board Input voltage:DC12-28v Style:D grade Input power:2x120W Chip:TPA3116D2 Using Audio Equipment:DIY Colour:Blue Material:ABS Size:9.2x6.9x1.8cm Package Contents: 1 Digital Power Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.