The Ctrl. 2 uses a high capacity 400 MaH built-in battery with no need for any magnetic cartridge attachments or threading. Simply open the lid, drop your cartridge into the spring-loaded chamber, close the lid, and you’re ready to go. The Ctrl. is inhale-activated and is always in standby mode. When ready to use, just inhale through the mouthpiece and a vaporized dose will be delivered. Enjoy the temperature where you like it most. This pocket-friendly device offers 4 temp settings (3.4V, 3.6V, 3.8V, 4.0V) with 4.0V being the default setting.