Green Smoke's patented 2 part technology includes a lithium-ion battery, a microchip controller and an LED light at the tip. This part of the e-cigarette looks much like the paper and tobacco part of the cigarette. The light at the tip mimics the "lit end" of the cigarette and will "light up" when the e-cigarette is puffed on. The "filter" part of the electronic cigarette is easily screwed onto the battery and contains the liquid nicotine solution with a built-in atomizer that vaporizes the liquid nicotine into a water vapor that looks and feels just like real smoke when inhaled and exhaled.