The indicator determines Dragon pattern.

It is based on the zigzag. There is buffer 0 which has no color located in the Colors tab. You will see the zigzag if you set it to some color. 

The indicator draws an up arrow when it detects a pattern which assumes further upward movement of the indicator. Similarly, the indicator draws a down arrow when it detects a pattern which assumes further downward movement of the indicator.

Parameters:

• alerts - show alert when an arrow appears.
• Push - send a push notification when an arrow appears (requires configuration in the terminal).
• HLPeriod - zigzag parameter similar to the ExtDepth parameter of the ZigZag indicator. The greater the value, the rarer the Zig Zag changes its direction and the rarer signals appear.
• MinHeight - minimum vertical dog-leg (in points).