Chip type: TPA3116D2 Power supply: DC 12-24V Channel amount: Dual 50W Product size: 37.2mm x 25.6mm x 1.5mm(LxWxH) color:blue Material: Metal Note: If your power supply and the audio equipment are common ground, when connecting the TV box, there be a little current noise because this amplifier board does not have noise isolation function for power supply. So, you need a common ground isolation board; Please enhance the heat dissipation such as adding a little heatsink chip on the amplifier board when your power is relatively higher or your amplifier board has been used for a long time. Package Contents: 4 x 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.