This product requires a separate power supply, so that there is no background noise and no interference, and the effect is menu-based operation. Can voice-activated sensing signals, saving the trouble of wiring, and can be used as soon as it is powered on (the default is voice-activated sensing input). It can be used as a Bluetooth receiver module. At this time, the 3.5MM headphone jack on the motherboard becomes a signal output port. Users only need to connect the signal input line of their own power amplifier, headphone amplifier, source speaker and other devices to the 3.5MM output port of the motherboard, and then connect the Bluetooth device named "BT-MUSIC" to . You can enjoy the jumping of the spectrum light while outputting audio. Can connect the audio signal line input and connect it in parallel with the input signal of the power amplifier for more accurate display. It requires users to have certain relevant knowledge and hands-on ability, and also needs to use relevant adapters. Regarding frequency band printing, the default operation is 50-4K frequency division mode. This is an optimized choice made because the product defaults to work in microphone mode. The effect can be guaranteed. If you need professional frequency sweep or complete matching with frequency point printing, please use 50-20K.