The Yihi ecigar chip has been hot selling for several years. You shouldn’t feel strange about it if you are a DIY fan. Since YiHi SX350 35w, the 2nd generation intelligent chip has been worldwide released in February,2014, the vapor industry got another important revolution. Buck-Boost&Boost available, be able to handle subohm 0.2ohm, By-passed(Mechanial Mode), Upgradable from 30w to 35w, 50w,60w or more… Notice: If you’re not skilled, experienced or comfortable with electronics or soldering, you should not be purchasing this chip! It is intended for experienced individuals only. You must check the board when you recieve it and prior to installation. Any board that has been installed and/or soldered on has voided any and ALL warranty claims. All the boards are pre-wired. Removing anything (including the screen, black glue, soldering joints of all wires etc.) voids warranty. These chips are strictly tested in the factory, so you shouldn’t worried about the quality. T...