The Oxygen Vaporizer 4.0 is a lower priced digitally powered portable vaporizer. Mobility is the key design feature of the 4.0 Mini. The Mini Oxygen 4.0 vaporizer can be powered with either the included power adapter or the rechargeable battery which provides for 1 hour of continuous use. Both are included!  In addition, the Mini Oxygen Vaporizer 4.0 can be used with the optional car adapter. The Mini Oxygen Vaporizer 4.0 is one of the most affordable portable vaporizers on the market and offers complete digital functionality.