A trading system based on the signals of the MFI_Histogram indicator. A trade signal is generated at the close of a bar if the color of the histogram has changed from a neutral gray to yellow or lime, i.e. when the MFI oscillator has entered the overbought or oversold zone. ...
from https://tradingrobots.net/exp_mfi_histogram-expert-advisor-for-metatrader-5/