The Exxus Twister Slim is a 510 threaded cartridge battery with a twist. The desired voltage can be set in increments from 2.0V all the way up to 4.2V with a simple twist of the base. The wide heat range allows you to dial in your vaping preference. As a rule of thumb, you'll get lighter, smoother draws that retain flavor when the voltage is set lower. If you want to really reach for the starts, twist this baby up to 4.2V and get ready for blast off. Works with most 510 threaded cartridges. Also features a pre-heat function.