The backlit display also flips out if you wander too far from your mobile, essentially doubling as a nifty cellphone finder after a long night of partying, and considering that a full charge will last you around five days, you can survive a week off without your AC adapter.

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Additionally, the notebook adapter is powered off the USB port, freeing up the user to sit anywhere in the room.

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Yes, that's right, we said AC adapter jack: unlike the X1, the S4 can't be driven off bus power alone, unfortunately.

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