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To start with, it doesn't require any batteries, as it uses the force of the body's own muscles. They are activated "by moving the residual finger when available, or the opposing finger when needed."
Thanks to its artificial tensors and the articulation's design, moving the residual fingers triggers a natural motion on its artificial phalanges, making it look as you are flexing a real finger. This means that the X-Fingers can be controlled independently, giving you a grip that is strong enough to do almost every normal task.