Bone conduction Ear Phone Headset VONIA EZ 900 4D real sound open ear Protect and surport deafness Safety 

* What is Bone conduction

* Product spec
 Type: Dual balance earset
Unit: BCT + Tweeter
Impedence: 10 ohm +/- 15 %
Sensitivity:  Air conduction 102 +/- 3 dB
                     Bone conduction 52 +/- 3 dB
Output: 5 mV  ( MAX   12 mV )
Cord : 1.2 m Y type
Plug : 24 J gold coated 3.5 mm
Color : gun metal 
* Componant: Main body( include mike controller ) earset tip ( L.M.S 3 pairs)
                         pouch