It's based on the breakout of the Donchain channel. You can configure the breakout sequence (default 55 channel) and how many ticks above or below.
It's configuration is dependent on what instrument you are trading and your own risk tolerance. The creator was using 55 seq, 5 ticks each way on 89 range GC running overnight. 100/25 RR - that doesn't mean its going to work for everyone, all the time. Your best bet is to join the discord and see how people are using it and testing it. My ATM for ES is 38/10