Eleaf has released several versions of box mods, mini istick, istick 20W, istick 30W, istick TC40W, istick 50W, istick 100W. These products are different from each other not only in maximum output wattage, also in function achievment and every version seems to make an improvement based on the previous version, for example, istick 30W has an extra arrow lock function, compared with istick 20W and istick TC40W is upgraded with the temperature control function, istick 100W contains  the changeable cell structure, which allows you to change with a spare cell. These progress and improvement in products makes Eleaf so popular among various levels of vapers, a beginner or an advanced vaper. Compared wuth Innokin iTaste VTR, Eleaf istick mod seems to have a higher cost performance, that is you can buy the similarly powerful product with a cheaper price. iTaste VTR with iclear 30 atomizer generally costs $60 and it provides the output wattage 3.0W-15.0W. iStick TC40W with temperature control function only costs about $40 and it allows the maximum output wattage of 40W. If you want a premium istick box mod with quality gurantee, recommend visiting the official authorized website to get one. Every vaper really needs a premium product to ensure safety and enjoyable vaping experience!