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Plastic Strip ?

Discussion in 'Electronic Basics' started by mowhoong, Apr 8, 2008.

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  1. mowhoong

    mowhoong Guest

    I purchased a book from the book shop which has a small plastic white
    strip attached
    inside the book,upon payment the casher will put the book on a special
    device mat.
    If this is not done, when you leave the store the security alam will
    go off.
    I opened the plastic strip and found two pcs of slim metal strip of 3
    cm length.
    I am curious what is the " magic " in this metal strip. Perhaps some
    members may have the same experience. Did any person know the " magic
    ". Thank you for advice in my question .
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