What electronic device could you not live without?

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I will start. I just had my very old zen xtra 50 gp mp3 player die after being drop once to often and i went into total withdraw from not being able to carry my music or audio books/podcasts around.Dropping everything else i went and pick up a new 120 G hard drive for it and downloaded the needed software to breathe new life into this old old player and did not rest until i had loaded all my music and other mp3 files onto the new hard drive. Now what electronic devices would cause a similar reaction with you friends???