The STR8 Vape Revolve is a twist-to-adjust push-button vape battery and it has a number of features. This variable voltage slim style vape pen comes with a 320mAh battery. The power settings can be adjusted between 2.0 volts and 4.0 volts with the twist of a knob on the base of the battery. There is a fifteen (15) second preheat function and the power button illuminates when pressed so you know it’s on and ready to fire. It also comes with a smart charger and if that isn’t smart enough; it also has a lifetime warranty. If you’re looking for a slim vape pen, look no further than a STR8 Vape Revolve slim vape pen.