This UV light wand can kill 99.9% of microorganisms by pure physical sterilization according to the approved laboratory research. It use the wavelength of 270-280 nm irradiation, can instantly destroy DNA and RNA of microorganisms so that they lose the ability to reproduce and survive. The ultraviolet irradiation will not damage any materials. It is easy to use as you just have to connect the USB cable to your battery powerbank. Designed to be light-weighted that makes it more handy that you can use anywhere anytime.