The RNA/DNA of microorganisms such as viruses and bacteria absorb ultraviolet energy in the 200-280 nanometer band, thereby inhibiting their replication and reproduction. 222nm UVC disinfection device’s disinfection principle: continuously emits UV rays in the 222nm band, which has been proved by research institutions such as Columbia University to be harmless to the skin and eyes of humans and mammals and will not cause cancer or ultraviolet burns.