The Range Expansion Index (REI) Indicator for MT4 & MT5 is a momentum-based oscillator developed by Tom DeMark and introduced in his book The New Science of Technical Analysis. Unlike traditional oscillators, REI is designed to remain relatively stable during sideways market conditions and to generate signals only when significant price strength or weakness is detected.

The indicator measures the pace and expansion of price movement, helping traders identify overbought and oversold conditions more selectively. REI values fluctuate between -100 and +100 and are displayed in a separate indicator window on both MetaTrader 4 and MetaTrader 5 platforms.

How the REI Indicator Works
The REI focuses on identifying moments when price movement expands beyond its normal range, which often signals potential market exhaustion or reversal zones. Instead of reacting to every minor fluctuation, the indicator filters out market noise and highlights only meaningful price extremes.

This makes REI particularly useful during range-bound markets, where many oscillators tend to produce frequent false signals.

Key Characteristics of REI

• Measures price expansion and momentum
• Values range from -100 to +100
• Designed to stay calm during consolidation phases
• Signals appear only at significant peaks or bottoms
• Suitable for confirmation-based trading strategies

Input Parameters

• REI_Period (default: 8)
  Defines the calculation period of the indicator.
  Increasing the value results in fewer but more reliable signals, while decreasing it produces more frequent but less accurate signals.
  The default value of 8 is recommended and generally should not be changed.
• EnableNativeAlerts (default: false)
  Enables MetaTrader popup alerts when REI crosses below +60 or above -60.
• EnableEmailAlerts (default: false)
  Sends email alerts when REI crosses critical levels.
  (Email must be configured via Tools → Options → Email in MetaTrader.)
• EnablePushAlerts (default: false)
  Sends push notifications to mobile devices when REI crosses alert levels.
  (Notifications must be configured via Tools → Options → Notifications.)
• TriggerCandle (default: Previous)
  Specifies whether alerts are triggered on the previous closed candle or the current forming candle.

Trading Signals and Strategy
According to Tom DeMark’s methodology, the REI generates signals as follows:

• Bearish Signal
  When REI rises above +60 and then crosses back below it, indicating weakening bullish momentum.
• Bullish Signal
  When REI falls below -60 and then crosses back above it, indicating diminishing bearish pressure.

While the REI should not be used as a standalone signal generator, it can be effective on lower timeframes and works best when combined with other tools such as trend direction filters, support and resistance levels, or price action analysis.

Best Use Cases

• Confirming potential market reversals
• Filtering false signals during sideways markets
• Enhancing short-term trading strategies
• Supporting momentum and exhaustion analysis

Conclusion
The Range Expansion Index (REI) Indicator for MT4 & MT5 is a refined oscillator that focuses on meaningful price expansion rather than constant fluctuations. By identifying moments of true market strength and weakness, it helps traders anticipate potential reversals and avoid overtrading during consolidation phases. When used as part of a broader trading system, REI can add valuable confirmation to market analysis.

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