Once you purchase your electronic cigarette you will want to use it as long as you can. Some people smoke more than others and that is why we cane out with the electronic cigarette USB charger. All you have to do is plug in the base electronic cigarette charger into your wall(the big black square module) and then plug in the little electronic cigarette USB module into the home charger. Once they are in place all you have to do is screw in the electronic cigarette battery into the USB port and a red light will come on to let you know the electronic cigarette battery is charging and when the light turns green the electronic cigarette battery is at full charge so that you can enjoy your electronic cigarette again.