We sell strong 270nm UVC germicidal portable hand-held lights. Beautifully designed, affordable and made in the Awesome USA. Each Sterile stick has Four 270nm LED germicidal lights. Light-weight, portable. Use anywhere! ATM machines, Credit card machines, keyboards, phones, money and much more. The lower the wavelength the safer it is for humans. Most sterilizers use 375nm and above. That wavelength increases your risk of cancer. We however uses UVC light numbering below 280nm. It kills the microbes but studies shown that it is very difficult for UVC light to penetrate the human skin. Keep in mind , The Sterile Stick is not meant for use on humans but it is intended for surfaces.