It acts as a barrier to protect brain and ear tissues from harmful radiation. Our motto- HELP your HEALTH & Keep yourself safe. It is made from that kind of material which becomes a barrier on radiations and reduce them. Also in the last picture of the product, you can see the reduction in measure of radiations on the radiation measuring device when it is fixed on a phone. Be assured, it is tested that it reduces the radiations. Key Points: 1) Cell phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues closest to where the phone is held. 2) Studies thus far have shown a link between cell phone use and cancers of the brain, nerves, or other tissues of the head or neck. Cell phones emit radiofrequency energy (radio waves), a form of non-ionizing radiation. Tissues nearest to where the phone is held can absorb this energy. Ques) What is radiofrequency energy and how does it affect the body? RF energy is a form of electromagnetic radiation (EMR). EMR can be categorized into two types: ionizing (e.g,x-rays) and non-ionizing (e.g,radiofrequency). Exposure to ionizing radiation, such as from radiation therapy, is known to increase the risk of cancer. However, although many studies have examined the potential health effects of non-ionizing radiation from radar, microwave ovens, and other sources. The ability of microwave ovens to heat food is one example of this effect of radio frequency energy.