ScentFIRE heats scent liquid turning it into a vapor which it then dispenses periodically into the air... that scent vapor, like the aroma of cooking foods, is much stronger and more likely to reach distant deer, especially when continuously dispersed. The ScentFIRE vaporizer takes pre-filled cartridges of EverCalm, VS-1, or RuttingBuck that each last approximately 50 hours on 3 minute mode. There are 3 dispersal modes: 3 min, 1 min, and standby; it can also be fired off manually.