This is the Third Iteration of the Zmax from Sigelei. This revision has a new PCB for better tuned voltage and wattage. It also has the new 8th menu option which changes the voltage calculation formula between RMS and Mean as well as the spiffy OLED screen. Ultimately if this means nothing to you, just bump the V or W until it tastes good!
This listing is for a full kit. You'll get the Zmax itself with the 18650 End cap, 2 18650 batteries, 1 battery charger, a CE5 Atomizer and a nice little gift box! This model also has 510 threading for connecting to the widest variety of accessories and a deep drip well that should allow most "Ego" threaded accessory skirts to fit beside the primary connetor threads.
The Zmax functions in either Variable Voltage (VV) or Power Regulated (PR) modes. In VV mode you can move in 0.1 v increments from 3 to 6 v. In PR mode it will adjust in 0.5w increments between 3 and 15w. The new PCB supports up to 4amp of output.
The device comes with a user manual for deciphering it's menu system. You will need it, this thing has a TON of options.