Boundless Cfv Vaporizer with Convection Airflow and Heat Retention RingsBy combining and improving some features of their first two vaporizers, the CF and CFX, Boundless Technology has raised the standard for portable vapes with the CFV vaporizer. This unit offers full convection airflow since there is a separation between the heat source and the herb chamber. Vaporization is achieved as hot air is pulled up through the herb with each breath. A digital display screen gives you precision temperature control that allows you