As any smoker, I hope one day to get rid of this slavery and costly long time I wanted to try the electronic cigarette. As it is not expensive, I started. When I received it, I was very disappointed. There are not any instructions and when you start, it's not obvious. So I did extensive research on the internet to realize that the atomiser is not an ego EC4 even if it may be compatible. There are no charger in the box as advertised but only the cable and the gift box, judge for yourself in the photo. I contacted the company who answered a manual in French will be available soon. If this is the case, I will give the 5th star. Nevertheless I put 4 stars because the device is beautiful chic and discreet, while metal. It works very well, smoke is generous and battery takes three days even with heavy use. To fill, unscrew the top (atomized) and turn the product along the wall. It is better not to fill it to avoid overflow and then screw the battery top. Now, regarding my smoking experience, this is only my opinion because I think everyone has their own sensitivities. So I use it for 5 days and I do not smoke more than 3-4 cigarettes a day, when I really envy and without any missing but I use a liquid with 16mg of nicotine (not always easy to find as prohibited for sale). I Vapote a flick every 5 minutes or less and I already breathe better. I appreciate being released from the ashtray and the unit is always ready. To turn it on, you must press the button 5 times until the light ring flashes. Ditto to turn off. If this ring illuminates when pressed, is that the unit is in operation. To recharge, I use a battery backup that allows me to use it during charging and not to return to the packet. I am now very happy with my purchase and I estimated the cost of using 3 a week. I wish me good luck and I will comment on that if I can share this experience.