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"There’s also a “move bar” that flashes red anytime you’ve been inactive for too long—a feature we, along with other reviewers, found highly motivating. It is currently the only fitness tracker that combines these features with the added benefit of never having to be hooked up to charger. Unfortunately, since the Vivofit relies on disposable battery power, the display is not LED or backlit for low-light conditions and the current mobile app/desktop software is still pretty basic. But we have four words for you: one-year battery life."