Vaporflask Classic is a dual 18650 device with max 150W power output. Vaporflask Stout is a single 26650 device with max 100W output. And Vaporflask Lite is a single 18650 device with max 75W power. These MODs feature variable temperature supporting Ni, Ti and SS coils. Additional features include upgradeable firmware, easy to operate user interface and innovative battery door.