The only other assembly required with the Flowtron was inserting the octanol cartridge, which slides quickly in to the cartridge holder on The underside in the device. The cartridge lasts about 30 days and costs about $15 for just a substitute 3-pack. Assistance rid your lawn of annoying bugs https://flowtron-bug-zapper-bulb82713.izrablog.com/29209045/5-essential-elements-for-flowtron-bk-40d