SMOK Mini V2 S coils are designed for use with the TFV V2 Tank and are specifically optimised for lower wattage outputs. They are built with medicinal grade cotton for fast wicking and great flavour and can produce large clouds even at low wattage settings.
SMOK Mini V2 S1 coils have a resistance of 0.15 ohm and are to be used at 40-80 watt outputs. For optimal performance, SMOK recommend you use these coils between 60-70W outputs.
The Mini V2 S2 coils have a more restricted airflow and are designed to last a little longer due to the position of the wicking channels. They have a 0.15ohm resistance and can be used at 30-70 watt outputs, though for best performance are recommended for use between 45-60W outputs.