WiFi Based Charging

This is something I can get behind.  uBeam - A wirelessbase charging system better than anything on the market with a farther range.  On one side, you plug into the wall socket an ultrasonic transducer and on the iPad, iPhone, or another device, an adapter. The transducer sends off an inaudible sound to the adapter which then converts the sound back into energy to charge your mobile devices.

How will this sound affect the human body?  I don't know if it will at all.  Even dogs will not be able to hear this.  And I've got a few more questions about it. Like how efficient is this system and how much it'll cost.

In the TUAW post where I found information, it mentioned that someone like Starbucks can install this and virtually free up the wall sockets.  

Source:  TUAW.

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