How does HomeKit presence detection work?

Cupertino, October 6, 2021

I'm fairly new to HomeKit, so please be merciful to me if this is a stupid question. I want to use some automation that is triggered when no one is home. From my understanding, HomeKit detects this by looking at the location of personal devices. However, I have an Apple Watch (Cellular), two iPhone devices (personal and work) and an iPad (Cellular) with me. What happens if I leave my phone at work or my iPad at home ... will I still be shown as gone? Thanks!

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