I guess you can call it like a preheat. it allows you to set watts in time intervals. so for example 65 watts for 2 seconds, 60 watts for 2 seconds, 5 watts for 2 seconds etc.
software: Bear_Army_Charon_v1.0.0-beta.txt
Manual: charon TC 218 firmware user manual v2.pdf
The mode always existed...