The PIC® Pest Free Living Insect Killer bulb is a dual-purpose bug zapper compatible with most standard light sockets. It is equipped with two lighting functions designed to attract and kill a wide range of flying insects, so, within each flip of your light’s electrical switch, you can navigate through each function. 1.) LED/Blue UV-A/Zapper, 2.) Blue UV-A/Zapper Only, 3.) All Functions Off Fits standard light bulb base. Insecticide-free solution