You are going to need to pull off the cover where the cord is kept. There is a small red knob, you can turn it with a screwdriver to adjust the temp. Despite the advertising, it is not calibrated from the factory and will require adjustment to set your perfect temp. Be aware.. Around 1/2 way through incubation the embryos will give off some of their own heat.. I've had to readjust mine halfway through incubation to not have the temp climb. Best of luck!