The SMOK OSUB 40W Temperature Control Starter Kit launches as an intelligent output system with pocket-friendly chassis combining one of the most compact sized fully featured mods the SMOK OSUB 40-Watt Mod equipped with a 1350mAh built-in battery and the Helmet Sub-Ohm Tank. Paired with the SMOK OSUB is the mini size Helmet Mini Sub-Ohm tank which features a 2 milliliter top filled tank reservoir and a stealth embedded airflow control system. SMOK's OSUB 40W temperature control starter kit is an extremely well balanced system at an affordable price point.