The Eleaf iStick 30W is a compact box mod with a 2200 mAh built-in battery. It offers adjustable wattage from 5W-30W and voltage from 2.0V-8.0V, supporting sub-ohm coils down to 0.4 ohm. Featuring an OLED screen, spring-loaded 510 connector, and various safety protections, it's designed for versatility and durability. It charges via Micro USB and includes button lock functionality.