【Function upgrade】In order to explore the maximum potential of this power amplifier board, we have developed an APP for this power amplifier board. You can adjust the sound effect of the power amplifier board through the APP, set the Bluetooth name and password of the power amplifier board, and even set whether a prompt tone is required.【High Compatibility】 The DC adapters on the market (plug size 5.5mm*2.1mm) can basically meet the needs of the Bluetooth power amplifier board. If your existing DC power plug is not 5.5mm*2.1mm, don't worry, because we include a DC conversion plug in the product.【Bluetooth and AUX input mode】 XY-E30H has input memory function. If the power amplifier board was in AUX mode last time, this time the power amplifier board will be in AUX mode, and the same is true for Bluetooth mode.【Treble and Bass Control】If you are tired of the natural treble and bass, why not try the treble and bass control knob! No matter what, you can always create the sound you like.【7*24 hours】Focus on customer experience and customer satisfaction is our service tenet. If you have any questions about the product, please feel free to contact us, we will give you a 100% satisfactory answer.