Fits Kamado Ceramic Grills: Big Green Egg - Medium, Large and XL KamadoJoe - Big Joe 18 and 24 Primo Grills - All The controller monitors the temperature of your smoker and controls a blower that manages the amount of air flowing to the fire, which controls the size of the fire and thus the amount of heat it generates. Flame Boss uses this mechanism to make your smoker work like an oven. Just set the temperature you want and Flame Boss will take over. It also functions as a meat thermometer and timer, two tools commonly used by pit masters. Flame Boss smoker temperature controllers are easy to use while still giving you many useful and convenient features. Easy to Use – not even an on/off button to press (it’s always on when you plug it in). There is only one mode, Automatic. If you want to cook at the same temperature as last time you don’t have to push a single button!