The indicator is based on the RSI and the Absolute Strength Histogram (more specifically the modification by Jie).
It is meant to be used to filter out periods of consolidation, and determine if the bulls or bears are in control when there is enough action to possibly start a trend.
The RSI is not used to find overbought or oversold conditions, but to find momentum and filter out sideways movement.
The ASH is used to filter out sideways movement by looking at the difference between the bulls and the bears and when the difference is below either the bulls or the bears, the market is considered to be consolidating. Otherwise, direction for possible trends are determined by which line is above the other.
Blue background = Bulls are in control of the ACTION
Orange background = Bears are in control of the ACTION
Gray background = No ACTION - DO NOT TRADE