The Bluetooth speaker is composed of one lithium battery (or two or more in parallel), charging management, Bluetooth master control, PA, speaker, and cabinet (some with diaphragm). The mobile phone or computer transmits information to the Bluetooth master through the Bluetooth transmission protocol. The Bluetooth master converts the information into a 12S signal, then converts it into an analog audio signal through the DAC, and outputs it to the PA for power amplification to drive the speaker. The speaker converts the electrical signal into sound, and the sound then resonates through the box and diaphragm to enhance the sound.