This section uses car audio amplifier chip TDA7388, this chip is commonly used in high-end car amplification, in the sound quality and volume resolution performance is very superior after all, the voltage is only 12V, built-in ultra-high-power mos tube, push each other to work, even if the load of 2 ohm speakers are no pressure, the front of the front if you configure the sound board can be configured to want to the high and low sound effects. Power supply: DC12-18V, DC input or terminal Input/Output: 50Wx4 Load: 2-8 Bluetooth: support 5.0 HD transmission, maximum distance 20 metres Input: Bluetooth + AUX + USB Heat dissipation: active natural cooling Protection: Support over-voltage, over-current, overload, short circuit protection. Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:As Shown Material:PCB Package Contents: 1 x Audio 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.