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To demonstrate its new hard-tissue conduction audio technology, Kyocera equipped a reference device, not meant to be sold in any retailer, with a ceramic transducer.
The transducer transmits sounds through the cartilage and tissue in your ear, and does not require an output speaker. Hence, this handset doesn't have one.
While listening to a TED lecture, the voices I heard, according to Kyocera, were bypassing my eardrum to become vibrations in my inner ear. This helped lower surrounding ambient noise.
During my demo with Kyocera's hard-tissue audio technology, I was able to hear the sounds coming out of the device very clearly as I pressed it against noise-canceling headphones.