... effective nice looking photocatalysis mosquito killer,mosquito trap, fly killer, fly trap, pest killer, pest trap enviromental, non-toxic, non-chemical, safe and ... hasadous viruses in the air. absorb various toxic and hasadous gas in the air such as formaldehyde, benzene and so on ... hasadous viruses in the air, absorb various toxic and hasadous gas. it can also kill fly and moth.