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The TS41 handset, manufactured by electronics firm Sanyo, was put on sale by the Tu-Ka cellphone group this month, drawing healthy demand from customers who want to hear calls better in busy streets and other noisy places.
The new phone is equipped with a "Sonic Speaker" which transmits sounds through vibrations that move from the skull to the cochlea in the inner ear, instead of relying on the usual method of sound hitting the outer eardrum.
With the new handset, the key to better hearing in a noisy situation is to plug your ears to prevent outside noise from drowning out bone-conducted sounds.
If the user holds the handset to the top of the head, the back of the head, cheekbone or jaw and plugs his or her left ear, the call will be heard internally on the left side.