Portable music players & smartphones have made earphones ubiquitous. But they are not without their shortcomings. They fall out, ambient sound intrudes & some people find them uncomfortable. Full size earphones have problems of their own.
Another alternative is bone conduction. You hear you own voice partly by bone conduction. This is why a recoding of your voice sounds so different than the way you normally hear it. The recoded version eliminates the bone conduction component.
Cynaps is a Bluetooth bone conduction headset which is fitted inside headwear, such as a cap or bicycle helmet. Headwear can be supplied with the headset fitted, or you can buy a kit which you can fit to your own hat or helmet.
http://the-gadgeteer.com/2013/02/27/cynaps-bluetooth-bone-conduction-headset-review/#more-123515 / baseball cap hat Max Virtual retrofitted it with. Their Cynaps system is a wireless Bluetooth bone-conduction headset integrated headgear listen to your music phone calls without wires or the need for anything in your ears bones skull compressional bone conduction high-pitched frequency sounds segments skull vibrate individually vibrations compression compressing compress bony case inner ear stimulate sensory cells perceiving sound waves in the air inertial bone conduction low-pitched low sounds vibrate the entire skull perception of sound just as if airborne compressional waves were moving those sensory parts while the skull was stationary /
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