Are you dudes talking about this?
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Power Balance is performance technology that uses holograms embedded with frequencies that react positively with your body’s natural energy field to improve balance, strength, and flexibility.

Most everything has a frequency inherent to it. Some frequencies react positively with your body and others negatively. When the hologram comes in contact with your body’s energy field, it allows your body to interact with the natural, beneficial frequency stored within the hologram. This results in improved energy flow throughout your body.
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....I'd steer clear of anything that reacts with your body's "natural energy field" - doesn't seem to help you talk to the dead though...I thought it would.