Welcome to Vapoisseurs and thank you so much for your review of the Volcano Classic theshivaplant ! Just to clarify, the portability and stealthiness in plug-in vaporizers refer to indoors. For example, a plug-in vaporizer with good portability would be a log vape like the E-Nano or the Underdog. Both are small vaporizers and easy to carry around the house. On the other hand, a stealthy plug-in vaporizer would be the Herbalizer, because for its shape it's difficult to imagine that it is a vaporizer for cannabis. A not stealthy plug-in vaporizer would be the Vapexhale, because it looks similar to a bong. I hope this clarifies the meaning of these 2 categories for plug-in vaporizers. Thank you so much again for sharing your review, have fun!