You know a sunburn is not actually a burn, right? Not a burn such as you would get from acute exposure to a hot stove or an open flame. Sunburns are actually radiation damage caused by ultraviolet light. In the short term, this UV exposure causes redness, pain and peeling; in the long term, too much unprotected exposure to sunlight can lead to skin cancer.
There’s a silver lining here, though: the same UV light (in particular UV-C light, which has a wavelength between 200 and 280 nanometers, while visible lights smallest wavelength measures 380 nm) that damages the very DNA of human skin over time can be harnessed and used to kill off germs in a matter of minutes.
With a good UV light sanitizing device, you can clean surfaces like desktops and door handles, sinks and toilets, or those items that are always with you, like your phone. And by the way? You should really clean your phone from time to time. According to multiple studies, our phones are about the dirtiest objects in our lives, harboring on average nearly 20,000 distinct types of bacteria.
And while wiping down a smartphone with soap and water or isopropyl alcohol might not be the best idea, UV-Sanitizer PRO won’t damage the device but will eradicate bacteria and viruses, so long as you use the sanitizing hardware properly and regularly.
Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.UVGI is used in a variety of applications, such as food, air, and any surface.

UV-C light is weak at the Earth's surface as the ozone layer of the atmosphere blocks it. UVGI devices can produce strong enough UV-C light in circulating air or water systems to make them inhospitable environments to microorganisms such as bacteria, viruses, molds and other pathogens.
The application of UVGI to disinfection has been an accepted practice since the mid-20th century. It has been used primarily in medical sanitation and sterile work facilities.

 - UVsanitisers