**********chip is a digital power amplifier chip, power efficiency is more than 90%, with low idle loss characteristics, so the calorific value is very small. *****Onboard front-facing IC to improve the input sensitivity, high-definition sound quality. *****This product is suitable for shop to attract customers, family audio and video, and empty square. *****This product has the characteristics of loud sound and excellent sound quality. *****There is no solder joint on the back of the circuit board, so there is no possibility of short circuit.