There's a great video describing what this is, and what it does.
For those of you who are familiar with the Darwin, what this device will do is take a 18650 sized Tube mod and turn it into a Variable Wattage device.
You may ask, what is the difference between Variable Voltage and Variable Wattage.
Variable Voltage mods just measure the voltage from the battery and then regulate the output of the mod to match the user selected voltage. This requires the user to pre-measure the resistance of the atomizer, plug in their desired amperage and then set the voltage on the mod accordingly. Since the resistance of atomizers change over time, it must be measured periodically by the user and then the user must adjust the voltage to get the desired wattage.
Variable Wattage, a variable wattage mod has to measure the output voltage of the battery and the resistance of the atomizer and then regulate to a specific amperage in order to get the correct wattage.
The only Variable Wattage mod right now is the Darwin, by Evolv - well Evolv has made this technology available for Tube mods now in the Kick!!!