Ultraviolet Light is extremely effective at disinfecting 99.99% of germs or any pathogens. Using the most optimal UV-C light frequency to sanitize surfaces in the matter of seconds. It has a built-in automatic safety switch, the ultraviolet light will automatically turn off when the rotating germicidal lamp tube is facing upwards in the working state. If you need to restore the working state, you only need to rotate the germicidal lamp tube facing down.