The SM233 uses 2 18650 batteries(not included), which provides the mod with a max power of 233W. So it is powerful enough for those vaping enthusiasts. The mod has a fast 0.8 second firing time with a cool LED breathing light. The mode can be compatible with all kinds of atomizers. Is is convenient to install and change batteries with its magnetic cover design. With a compact design and small size, it is portable and convenient to carry during travel.