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3 Prong Style - only fits standard 3-prong outlets (one screw in the
center of the plate and two slots and one grounding hole top and bottom--see large photo with hand in it)

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2 Prong Style - only fits standard 2-prong outlets (one screw in the
center of the plate and two slots top and bottom--no grounding
holes--see picture to the immediate right of the 3-prong photo)

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Decora Style - only fits decora style outlets (2 screws--one in the
top of the plate and one in the bottom of the plate--no screw in the middle--see picture to the right of the 2-prong style)

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