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I could find a hint of the design from a TV remote controller without it`s batteries cover. Although a battery is a necessary factor of the remote controller, it is always covered up and used only as an energy source.
Let's take out a battery from the inside!
Round shape and symbols of plus (+) and minus () of the alkaline battery could be a great interface of rolling and excellent pushing buttons.
Now the TV remote controller needs only two design factors: A power button and a battery hole.