This is a trend-following momentum indicator.
When blue line falls below red line, it's a bearish signal.
When blue line rises above red line, it's a bullish signal.
The mechanism is similiar with MACD.
But the calculation method is a little different from MACD.
Combined with Professional Trading Signal, it could work as a filter.
Also it could work alone to identify the market trend direction.
If you have some other questions, please leave your comments here. I'll reply within 24 hours.Good Luck!