> For the complete documentation index, see [llms.txt](https://docs.bigbeluga.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bigbeluga.com/main-toolkits/market-core-pro-tm/session-opening.md).

# Session Opening

The Open Range Breakout (ORB) feature in Market Core Pro identifies volatility and momentum opportunities as major trading sessions open. 

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It automates opening range box creation, breakout signal generation, and full global session range tracking.

##

## Enable ORB & Core Display Controls

Toggle Enable ORB inside the indicator settings to plot opening ranges directly on your chart.

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* Enable ORB: Turns the Open Range Breakout calculations and drawing tools on or off.
* Signals: Displays directional buy/sell breakout arrows (`ORB ▲` / `ORB ▼`) on the chart when price breaks out of the established range.
* History: Retains past session boxes and breakout lines on historical price action for backtesting.
* Color Controls: Adjust the visual color palette for range boxes, upper boundary lines, and lower boundary lines using the top color pickers.

##

## Session Selection & Custom Ranges

Define which market open to track using the ORB Session dropdown menu:

* Preset Market Opens: Choose from New York, London, Tokyo, or Sydney. The start of the selected session is marked on your chart with a vertical shaded line labeled at the bottom (NY, LO, TO, or SY).

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* Daily & Weekly Opens: Select Daily Open or Weekly Open to anchor the opening range to major higher-timeframe opens.

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* Custom Session Time: Select Custom to specify custom start and end times using the time inputs (e.g., `10:00 - 10:30`).
* Custom Timezone (UTC): Align custom session times precisely to your local time zone (e.g., `UTC+2`).

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## Breakout Signal Logic & Line Extension

Once a session opens, the indicator draws an Opening Range Box over the opening duration:

* Boundary Lines: Upper and lower horizontal lines extend from the range box to map breakout levels.
* One-Time Breakout Limit: A session range can only break once to the upside and once to the downside.

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* Line Extension Freeze: As soon as price crosses either the high or low boundary, that line stops expanding past the breakout bar, and an ORB signal icon triggers.

##

## Full Global Session Range Highlighting

Highlight entire global Forex sessions across your chart by checking any of the bottom session toggles:

* Session Overlays: Check New York, London, Tokyo, or Sydney to display a colored background box covering the complete trading session.

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* Real-Time Dynamic Expansion: Active session boxes expand vertically in real time to capture the exact highest high and lowest low reached during that session.
* Custom Background Colors: Customize individual shading colors and opacities for each session directly next to its checkbox.

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## Settings

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| Setting                                                                             | Description                                                                                                                                                                                                                                                                                                   |
| ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <ul><li>Enable Session</li><li>Signals</li><li>History</li><li>ORB Colors</li></ul> | <ul><li>Toggles the session open zones and price channels on or off.</li><li>Enables or disables breakout signals when the price exits the session channel.</li><li>Toggle visibility of past session history on the chart.</li><li>Customize Open Range bullish, middle ORB line or bearish colors</li></ul> |
| <ul><li>ORB Session</li><li>Session Color</li></ul>                                 | <ul><li>Dropdown menu to quickly select New York, London, Tokyo, Sydney, Daily or Weekly market hours. </li><li>Customize the background color of the session zone for better visibility.</li></ul>                                                                                                           |
| Custom Session Time                                                                 | Defines the specific time range (e.g., 10:00 – 10:30) when the "Custom" session is selected.                                                                                                                                                                                                                  |
| Custom UTC                                                                          | Adjusts the time zone offset (e.g., UTC+2) to ensure the session aligns with your local or exchange time.                                                                                                                                                                                                     |
| Global Forex Trading Sessions                                                       | Toggles session Overlays: New York, London, Tokyo, or Sydney to display a colored background box covering the complete trading session.                                                                                                                                                                       |