Not sure, if it's like find my phone (not sure if's the same as the find app, for my wife/son/daughter/ brother phones / locations), then it is anywhere the relative phone connects to.
But not totally accurate down to what
Marco Polo might be *AFAIK . . . Find My app just uses cel tower info ?
It might use gps, not sure, all I care about is checking the family's all safe from location.
Part of the blurb does say within range, and the "20' to the left" type of message leans towards bluetooth.
Could be useful if DJI Find my drone works to get you close, then fine tune with this and the audible sound it can produce ?
I'm wondering about how it's powered, and how often battery might need changing.
Just saw CR2032 battery.