Find my mobile but on a different or second mobile
At the top left there are icons for each device, and you can tap on one to select a different device.
This may include older devices if you haven't removed them from your account yet, but they'll fail to work if you're not signed into the device.
For example I have a tablet listed that I no longer own and removed my account from and it eventually fails to connect with the message &quot;Can't reach device&quot;.
Best to let the sound play for a moment before pressing the power button as it may not be detected on first press otherwise.
Note that this is a website-layout-dependent answer and the moment they change it this will be invalidated.