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All you have to do is plug the cord into an outlet, connecting the nail to the power box. The nail is used as a bridge between these two pieces. When the nail is placed in the rig, you can adjust the temperature to one that is easy to work with for you and what you're smoking. The nail gets very warm, so you shouldn't touch it while the unit is plugged into the wall. There are various nail sizes that come with the kit depending on how much heat you want. There are different fittings for male and female pieces, but with the instructions and the simple joints, it's easy to determine how the nails fit together.