EMFs are Electromagnetic Fields -invisible lines of magnetic force that emanate from frequencies with electric and magnetic properties. 
There are natural sources of EMFs, from things like lightning and sunlight, and there are unnatural EMFs produced by human-made Electricity and wireless communications. 

Electricity emits EMF called ELF(Extremely Low Frequency) with frequencies from 3 to 30 Hz. Some studies connect exposure to ELF to severe health issues and illnesses such as Alzheimer's disease, different types of cancer, and even childhood leukemia.
The second spectrum of EMF is called RF (Radio Frequency) in a frequency range from around 20 kHz to about300 GHz.  If the body absorbs RF radiation in large enough amounts, it can produce heat. This can lead to burns and body tissue damage. Some studies concluded that In some circumstances, some forms of non-ionizing radiation might still have other effects on cells that might cause cancer.

In 2011,the WHO and International Agency for Research on Cancer (IARC) classified radiofrequency electromagnetic fields as possibly carcinogenic to humans (Group 2B). This decision was made based on an increased risk for glioma, a malignant type of brain cancer associated with wireless phone use.
In 2018,after three years of research, the NTP concluded that there is clear evidence that male rats exposed to high levels of RF radiation (RFR) developed cancerous heart tumors,
Today you are surrounded by EMFs that are potentially harmful to your health and even Carcinogenic. 
And while you can't hide from it, the GOOD NEWS is that you can be protected!
Over the years, we at Smart&Safe developed the biggest EMF protection catalog in the world so that you can be shielded, literally head to toe.
THIRD-PARTY CERTIFIED LABORATORIESTEST RESULTS BACK UP ALL OURPRODUCTS!