Yes, it’s non-invasive and generally safe with no known serious side effects when used correctly.
The device offers 4 intensity modes to suit your needs. The highest setting feels similar to touching a slightly warm tea cup with your fingers. The LEDs never come into direct contact with your skin, as there is always a small silicone layer for comfort and safety.
The near-infrared light spectrum is not visible to the human eye, and therefore any light that has a wavelength greater than around 810nm, you will not be able to see with your naked eye (810nm still has a visible light purple glow). Your body will still be feeling all the powers of the light wave lengths though!
Both Red Light and NIR light are a part of the light spectrum of the sun. Red Light emits wavelengths of between 600-700 nm and near-Infrared Light (NIR) is invisible to the naked eye and has a wavelength of 700nm to 1000nm. NIR can penetrate the skin much deeper than red light, including all soft tissue, connective tissue, and bone.
Typically, 30-60 minutes per session a few times a week.