Dial into your voltage with the silky smooth twist knob at the bottom of the battery that allows you to adjust between 2.0 Volts and 4.0 Volts to pick the perfect temp to vape the best 510 thread vape carts on. Don't get worried about taking your charger everywhere as this slim vape pen has a 500mAh high capacity battery to make sure you have plenty of juice between charges and you lay down consistent power every time you take a puff. This stick battery feels like a high quality writing instrument in your hand or pocket with a solid body and precision quality and resistance on the button. The HoneyStick 510 thread twist vape pen battery also has a pre-heat function so you can get your carts primed and ready. Compatible with 510 Vape Cartridges.