Anti Radiation Principle:
1. None-magnetic filed earplug
There is no loudspeaker set in earplug, which avoiding the direct harm to eardrum and brain brought by 1000 Guss permanet magnetic field and alternating magnetic field

2. Air Tube 
It isolates mentioned above magnetic field and radiation source. Moreover, it lengthens the distance between mobile phone and human body, which largely decreases electromagnetic field. Three electromagnetic radiation research organization have confirmed air tube earphones is the best choice to reduce mobile phone radiation harm.

3. Metal Shield Wire
Metal shielded wire: we mean that our copper cable is coverd with a braided spiral winding of copper tape layer, net-shaped. 

Firstly, it acts as a Faraday cage to reduce electrical noise from affecting the signals and minimizes capacitively coupled noise from other electrical sources, which can ipmrove the sound quality.
 
Secondly, it can reduce electromagnetic radiation from cell phone.
 
Thirdly, made of the strands of copper, 2.5mm, it strengthens the tensile strength and extends service life.