As I understand it, the xG3 as “sensing magnet” struggles due to the high inertia of the larger magnet and the thick encapsulation is not influenced enough by the tiny fields around wires and such. It however works well for audio (Tragus Implants) so I imagine it would work in the same way. Learning the signal would be tricky however, also the impacts of not always having the sense (recharging, showering etc) would be interesting.