The ‘Zig’ holds the heating and operational control unit, the micro-processing unit (MPU), and the battery power supply unit.

The ‘Charger’ is needed to re-charge the battery power supply unit of the ‘Zig’ from time to time.

The ‘Filter’ contains the nicotine and aroma equivalent to one regular cigarette. SFI, with its brand REAL, offers a variety of aromas.
Read more at The Military Times: Navy Times Scoop Deck