Some Bluetooth speakers have features that can be seen especially on some connected speakers, such as the ability to manage them remotely using voice assistants such as Alexa, Google, and others.
The function of association between several speakers, in order to create a stereo effect, or the multi-room, which makes it possible to synchronize several speakers in several rooms of a house for example. Some models are configurable from a dedicated application, while others simply do not have one. Do not hesitate to check all these points before making your choice.