Thank you for writing to us, Kindly understand Visible light rays are also classified as Electromagnetic waves. However Light waves are multi-directional and don’t concentrate on a point unless it passes through a magnifying glass. On the other hand, microwaves that generate mobile radiation are uni-directional, form an electromagnetic field around the antenna, and generates a force that might impact the human body adversely. blocks EM waves, segregates, and grounds the electric field effectively to reduce the impact of mobile radiation on the human body.