... VV Mod,variable voltage ego ,black tube 2.the voltage can be adjusted from 3V-6V 3.18650 ... 800 puffsCharging time2-3 hour There are 4 buttons on the 18650 VV Mod: 1. "+" button, on press ... 5 second to turn off device 4. The activation button (the big one), held down for 10 seconds ... SGS, ROHS, ISO9001 proved certificates. Safe system in the e-cigarette cut off automatically when inhale lasts too long ...