Bluetooth module is a PCBA board that integrates Bluetooth function and is used for short distance wireless communication. It is divided into Bluetooth data module and Bluetooth voice module according to function. Bluetooth module refers to the basic circuit set of chips integrated with Bluetooth function, which is used for wireless network communication. It can be roughly divided into three types: data transmission module, Bluetooth audio module, Bluetooth audio+data two in one module, etc. General modules have semi-finished properties and are processed on the basis of chips to make subsequent applications simpler