The only real other assembly essential for the Flowtron was inserting the octanol cartridge, which slides simply to the cartridge holder on the bottom from the unit. The cartridge lasts about thirty days and expenses about $15 for a alternative three-pack. Say goodbye to pesky flies and biting mosquitoes https://flowtron-bk-40d-electroni95269.bloggactivo.com/28339352/flowtron-bk-40d-electronic-insect-killer-fundamentals-explained