To use the Vestratto Anvil, you'll first start by using one of the screw-on 0.25g chambers into the oven on the opposite end of the 14mm mouthpiece. You'll notice there's some room for airflow around it on the stainless steel. This is where the hot air from the copper battery will travel into the chamber and then eventually to the mouthpiece as vapor. At the top of the herb chamber closest to the end of the battery are the two snap discs. This is what we meant earlier in the review when we said that the click is calibrated to the chamber, not the lid as on the DynaVap. The herb chamber has a hole above the heat clickers so that it can echo and can be heard by the user.