The handheld UV lamp irradiate the single-cell microorganisms such as cells and viruses with UV light to destroy the structure of DNA in the center of their lives, so that the proteins that make up this organism cannot be synthesized, causing them to immediately die or lose their ability to reproduce. Under normal circumstances, UV light irradiation for more than 10 seconds can achieve the effect of sterilization. It is suitable for the sterilization and disinfection of computer keyboards, tablet PC,mobile phones, desktops, door handles and kitchen utensils.