I recommend the normal Samsung Galaxy Watch4 and not the EU model. Unfortunately, various functions are not possible with the EU model. To use the Google Assistant, I have linked you to a website with the instructions: https://www.netzwelt.de/anleitung/203943-samsung-galaxy-watch-4-google-assistant-so-installiert-nutzt-ihn.html This Watch has a built-in microphone as well as the speaker. https://www.samsung.com/de/support/mobile-devices/wie-verwende-ich-die-anruf-funktion-der-galaxy-watch/

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Yes, I charge the watch every evening. But it's quick, about 1 hour.