The tracking device then is snapped onto the tracking mount. To remove the tracking mount from the pet collar, use a flat screwdriver and pry the rubber strap from the back of the pet collar, effectively stretching one end of the rubber strap up and over the lip. Once you get this far, the rubber strap can be easily removed.
Link: https://www.amazon.com/Tagg-GPS-Pet-Tracker-Attachment/dp/B0077I42S4