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One imperfect option is the Mictrack MT710 https://www.mictrack.com/product/cat-m1-nb-iot-pet-gps-track...

A bit too big for a cat. Also doesn't have bluetooth or a speaker so you can't narrow the location once you get close (you could add an airtag for that, more $, more bulk).

Waterproof.

Relatively inexpensive.

Has a documented API or you can use the Petovik app to track 1 item for free.

Can change modes by sending a command through the SIM providers SMS command or through one of the tools linked in the Petovik app (the command is only received when the device is "awake"). The modes with highest resolution allows 10 sec updates. There is also a "LOCK" mode which lets you switch to high frequency updates for a specified period of time.

Battery life is almost a day if you use "sleep when not moving mode" and set updates to every 2 minutes or so.



Definitely too big. I use the FitBark GPS 2: https://help.fitbark.com/en/articles/6999814-what-are-the-fi...

Which is 47 mm x 30 mm x 15 mm vs the Mictrack's 46mm x 41mm x 16mm - and that 11 extra mm would make it not work on a collar. Fitbark does have Bluetooth.




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