The Pet module has GPS, while the Guardian module doesn’t - it serves as a gateway between the Pet module and your smartphone.
The presence of the Guardian module eliminates the need for a cellular connection to obtain the GPS coordinates, which is why there are no monthly fees!
Both modules are necessary in order to use Findster Duo.
The pet owner should keep the Guardian module with him/her, while the Pet module should be attached to the pet’s collar.
[Photo with caption soon]