Gold wave ultraviolet rays can destroy 99.9% of bacteria. UVC LED emits UVC light with high photon energy, destroying the molecular structure of DNA/RNA in bacteria/viruses, killing the rowing and regenerative cells, to sterilizing the surface of the toothbrush and brush head. Friendly designed blue indicator light to remind avoiding UV radiation. Built-in two sets of LED lights, UVC + blue indicator. Since UVC is invisible, the blue LED is designed to remind us that the device is in working status. Automatic sterilization for 2 mins every 6 hours. Up to 20 days battery life via 2.5 hours fast charge. The three-size card slot design can fit most mainstream brand toothbrushes, electric toothbrushes, and some razors on the market. 3M wall sticker, tight installation. Detachable toothbrush holder slot, easy to remove for cleaning. When charging is needed, remove the sterilizer from the wall sticker, safe and clean. Device warranty: 3 years* * By registering your Oclean product on this page, you can extend your warranty by an additional one (1) year, in addition to the standard warranty coverage. This additional warranty extends the total coverage period up to a maximum of three (3) years from the original purchase date. To register your device and activate the extended warranty, visit: https://europe.oclean.com/pages/1-year-extended-warranty