If you are a starter of eleaf istick electronic cigarette mod, eleaf istick 20W could not be better option. This tiny stuff holds powerful functions, such as atomizer short-circuit protection, 10 seconds dry burning protection and other protection functions, also voltage and wattage adjustment. Its power with 20W and battery capacity of 2200mAh will absolutely be enough for your vapor requirement. What a pity, it does not have arrow button lock function and only istick 30W or higher versions provides this feature. With careful operation, you can still freely enjoy your vaping experience even without this extra funciton. Moreover, the incremental OLED screen also provides concise and clear information on current voltage, wattage, resistance and remaining power. More operation guidance on the carried user manual if you purchase one on eleafistick.org.