All of them.

Pull out the battery, wrap the computer with about fifty pounds of sheet lead, put it in a faraday cage inside a safe inside another faraday cage, at the bottom of an old salt mine.

If you want on that is fully functional under all EM conditions that are not sufficent to destroy human life, might I recommend on of these with a quality stylus.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.