Review: AfterShokz Trekz Titanium
Sound in the skull
Trekz Titanium does not enter the ear, but instead pumps sound in through the cheekbones.
AfterShokz Trekz Titanium
The Titanium hoop sits as if glued to the head. Because the ears are free, one can still hear everything that is going on around one.
As expected, the sound is not outrageously deep or high. Its use is somewhat limited.