The NO2 Vaporizer is the newest in the oxygen vaporizer lineup. The Vapir NO2 is a portable vaporizer that has digital temperature control, which allows you to control the temperature with an accuracy of 2-5 degrees. This digital control gives you precise and efficient vaporization that is not found in other portable vaporizers. Unlike other portable vaporizers that use butane, the Vapir NO2 Vaporizers us a rechargable battery, providing you with a cleaner taste. The Vapir NO2 features a standard 1 year warranty.