Does the smart speaker have a monitoring function?

First of all, smart speakers have the ability to monitor. Reason: having a microphone to collect surrounding sound, in principle, it can keep the microphone in working state to collect surrounding sound. In fact: products don't do this because it doesn't make much sense. Most smart speakers are used in fixed scenes. The effective sound information around them is too short in a day. Unlike video, there are images, which can quickly locate some effective information in video. The sound is chaotic. If you miss the information in one second, you may miss it. If the monitoring function is made into the default function of the product, and the microphone is always on to collect sound, it will consume a lot of bandwidth and server. the loss outweighs the gain. There may be a switch similar to the manual control of the administrator to monitor the movement around a speaker. But it is only a special case and conjecture. I don't know if it really exists like this.