The way I am understanding @drewg, his question is if he is using the “Find My Phone” feature on the band: Does the app have to be open in order for the band to cause the phone to “make some noise”? To me it sounds like he is concerned about the phone battery life draining quickly with the app having to be open all the time. (Andrew does not say what type of device he is using. I have a Galaxy s8 running Android.)
So I tested the feature on my phone. I added “Find Device” to the band and then closed the app UI on the phone. I pressed “Find Phone” on the band and the phone vibrated and gave to cute little ring. My Wyze app is always running in the background and was connected to the band. When I force closed the app. The band was no longer connected to the phone and the “Find Phone” didn’t work.
So, the app does need to be running in the background at the least to be able to find it. If you are not close enough to the phone to maintain the BT connection, the band will not find it.
On a personal note, I don’t have a use for this feature. If the band is not on my wrist, it’s on the nightstand. And I always have my phone with me.
@drewg, does this help?