: This involves direct contact between the material and a heated surface. It usually allows for faster heat-up times and simpler device construction.
: Devices are often shaped to fit comfortably in the hand or pocket. kelsi monroe 420 portable
: This method uses hot air to pass through the material. While often requiring more battery power, it is frequently cited for providing more even heating and better flavor preservation. Key Functional Features : This involves direct contact between the material