This cigarette contain two parts: the disposable atomizer and chargable battery. The cartridge and atomizer are a whole part,we call disposable atomizer, the length of it is 40mm,the length of the battery is 84.5mm, the total length of the cigarette is 125mm. The special point of this model is that there is a manual switch on the battery, you can control the cigarette by this switch. The advantages of this cigarette are the following:easy to use and easy to control. Each disposable atomizer can support 300-350puffs.