evidence: Some scientists are arguing that these headphones could potentially lead increase cancer risk due to the fact they emit radio frequency (EMF) radiation when they are used. In 2015, a group of scientists around the world signed a petition directed to the United Nations and World Health Organization that expresses their concern about exposure to non-ionizing electromagnetic fields (EMF). The petition, which started circulating around the internet again in early 2019, also says that EMF has the potential to increase the risk of neurological disorders, DNA damage, cellular distress, and changes to the reproductive system. [...] Ultimately, when it comes to wireless headphones, its dangers aren’t all that clear. Despite extremely low frequency EMF being possibly carcinogenic to humans, researchers have still not observed a direct connection. Bluetooth headphones specifically have their power density exposures that is 10 to 400 times lower than those of cell phones, according to Dana-Farber’s David Kozono, MD, PhD. Power density is the rate of power that an EMF produces per the unit area. "I would therefore expect it would be more difficult to observe an association between Bluetooth headphone use and cancer," Kozono says. "Data are lacking however to conclude with certainty that there is or is not a risk of increased cancer."