Voice recordings (or video - this device seems to be capable of both) has to be justifiable and with clear and unambiguous consent [0]. The person(s) recorded have the right to access and/or delete the recordings at any time. The retention period is "only for as long as needed... for purpose" which suggests there has to be a purpose.

All of the above can be found here:

[0] https://recordinglaw.com/eu-recording-laws/

I'm just going to point to Perplexity here since this is rather basic: https://www.perplexity.ai/search/how-does-wearing-ai-powered...