Flash kit  is designed for beginners and medium vapers,powered bysingle 21700 battery compatible with 20700 and 18650 batteries. It comes with intake new innovative mesh coil made of supper SS 890L which has more resistance to oxidation and corrosion.So this coil has longer lifespan than regular mesh coil.Flash kit means you can put our flash light bulb on the mod and turn it into flashlight.