The cartridges do not last long. The batteries are irregular in performance and have a long list of do's and don'ts with them. Whilst these are among the cheaper versions of lookalike electric cigarettes, they are a waste of money. I recommend Halo from Ecigarettes Direct which are slightly more expensive but well worth it as the cartridges last at least twice as long. (I use, first, Green Smoke which was good until it moved to USA, second V2 until I got fed up with the multiple failures of the equipment and am now using Halo; their products are much better thought out (hermetically sealed cartridges for example), taste like a real cigarette and are easy to use.