We strive to create the most reliable, discreet vape batteries on the market. There are so many different cartridges on the market, and they all perform well at different power levels. That's why all of our vape batteries have variable voltage (power) settings. Just three simple clicks changes the power to allow you to customize your vaping experience. When the power light flashes blue, that's low, green is medium and red is high. If your vape tastes burnt, lower the power and enjoy both the feeling AND the flavor!