... puffsCharging time2-3 hour There are 4 buttons on the 18650 VV Mod: 1. "+" button, on press ... 2. "-" button, on press you can decrease the voltage from 6v-3v, when you reach 3v it ... for 10 seconds or longer, the vv ecig will shut itself off until the button is released. Green and Health ... SGS, ROHS, ISO9001 proved certificates. Safe system in the e-cigarette cut off automatically when inhale lasts too ...