toad I think it is just a question of time before someone appears here with such a belt. It seems to me that it would be very tempting to some parents that they would be able to control their offspring even when they are not at home. With the remote unlocking, it becomes feasible to keep someone chaste who is no longer living at home, because no parent needs to be present for sanitary breaks, sports, doctor visits, etc. With just a tap on a phone the belt comes off. Of course the parent still needs to have some leverage (like financial support) to make the wearer put it on again, but then with a video chat they can check that the belt is put back on correctly at the appointed time. (At least I assume that the belt will be able to determine by itself if it is locked again, but not if it is actually worn, and by the right person, so a visual check would still be needed.)
And the scariest part is that even though such a belt might be bought simply for the remote release option, the disciplinary options, like electroshocks, are at the parent's finger tips as well, and thereby quite tempting to be used.