Question about Eve Motion (Matter)

Dear Community To my astonishment, this sensor seems to register movements and light even if all devices acting as a bridge (Apple TV, HomePod) have been disconnected from the power supply. The movements registered during the power cut are then displayed in the Eve app. I think this is an absolutely great thing. Out of interest, I would now like to ask how this works in the first place. Is there some kind of memory in the Eve sensor for just such cases of power failure ? Just curious as this happened to surprise me positively today. Have a nice afternoon!