SAFE: The mask is made of premium PVC and EL cold light wire which has no UV harm, radiation, and no adverse effects on human body. Also, it is environmental and non-toxic. COMFORTABLE: Our light up mask has an adjustable elastic band. It fits well for most adult and kids face. Comfortable and breathable. Multiple Modes: The mask control have 3 lighting modes: Steady Light, Slow flash, Fast Flash. You can change the light modes as you want.