The dual coil unit can only be used with a special CS (changeable system) type glassomizer or clearomizer! In order to use the dual coil unit, connect it with the glassomizer/clearomizer bottom part and make sure it is properly fixed! NB! The coil unit is not pre-moistened! Wait at least 5 minutes after the initial contact with e-liquid so that the coil unit would be saturated with sufficient amounts of e-liquid!