That EA doesn't use any indicator, because it opens a sell and a buy trade at the same time, so it is a kind of hedging.
Both trades stopp loss at 99 pips and take profit at 100 pips, so the difference of 1 pip is profit.
Works best on 1 min Chart
Example below 1min EURUSD Jan-Dec2018:
Expert adviser that use a custom modified Awesome Oscillator indicatorRelative ATR
Shows what % the current ATR is relative to it's historical value.