From Frontgate:

Micro-sized for convenience, this Mini Wine Enhancer is discreet enough to bring with you while dining out. Balance the tannins of your favorite wines while brightening the flavor. Rather than magnets, harmonically balanced frequencies are used in conjunction with crystals and metals to enhance wine’s flavor.
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That sounds like some blair witchery, right there. It even looks like your mean stepmother’s tumor wart. You’ve got to put the suction cup on the glass for 6-12 minutes while the crystals “cast a spell.” But hey, if you’re okay with some hobgoblins here and there, and it can prevent the RWH syndrome (red-wine-headaches), then maybe it’s worth a shot. It’s $50.