The Mini 30 Watt Box by Sigelei is a powerful and versatile box mod. With the ability to adjust your wattage output from 5 watts to 30 watts it also features the unique ability to switch from the regulated power mode (PWM) to a mechanical mod mode (DC-DC). This mechanical mode allows for you to bypass the chip-set so you can vape at an even lower sub-ohm levels; can fire as low as 0.3ohms! The Sigelei Mini 30 is unique hybrid with both an internal battery and a battery slot for a single 18650 battery. On the side of the device is a magnetic slide that covers your single 18650 battery compartment but on bottom you will notice a micro USB charging port for your internal battery. This passthrough technology makes vaping WHILE charging your battery possible! The magnetic battery cover also comes with three large vent holes for added user safety. All-in-all if you're looking for a versatile high-quality and portable vape device you've found the perfect one.