evidence: Bluetooth devices emit low levels of nonionizing radiation. Exposure to low amounts of this type of radiation is not harmful to humans. [...] It is important to remember that there is not a lot of research on the specific issue of Bluetooth headphone usage. Most research appears to focus on exposure to high level nonionizing radiation. [...] So, even if cell phone usage does increase the risk of certain health conditions, it may still be safe to use Bluetooth headphones.