Powerful yet more intelligent, the new iStick TC100W is skillfully engineered with the latest temperature control system. Not only does the iStick TC100W feature its magnetic covers for ease of replacing your 18650 cells, it also presents you with upgradeable firmware and switchable TC(Ni/Ti/SS/TCR)/VW/Bypass modes. In addition, an ergonomically designed shape with hidden button is for better grip action.