1. Delrin lined tube to decrease the likelyhood of shorts from damaged battery wraps. 2. Mechanical button with 3 points of contact, no springs or magnets needed. This helps to reduce hot buttons and misfires. 3. Silver contacts, no hybrid connections and no accidental shorts from using the wrong atomizer. 4. Proper vent holes direct venting downward and away from your head and eyes. 5. Works with many 18650s, please use high amperage/high drain batteries.