These classic batteries are still some of my favorites, plus this one is super cool-looking! Now you may say this is just a battery or that buttons are old tech, but I like the button. The reason I like the button is because a lot of cartridges seem to clog, and when they are activated on the draw, it makes it a little hard to clear. These batteries with a button have a preheat feature that allows you to warm up the oil and loosen it up before you take a hit. It also has an adjustable power setting at the bottom, that can be changed by simply twisting the bottom piece. You will see a dial showing voltage, so to take a bigger hit with more vapor, simply use a higher voltage.