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There are a few useful parts.. a nice piezo sounder.. a cool lithium battery. .. two crystals and two useful microwave diodesI'm sure someone can come up with a more creative and imaginative use for these devices. Perhaps open them up, and use the electronics inside for something else?
If I was stupid enough to get one in the first place, perhaps I would've made this a little project of mine. But there is no way I'm supporting this e-toll crap, not even for creative R&D.