Order Book shows Level 2 depth for the linked security: resting bids and asks at each price, with size and cumulative size.

**OB** follows its [link group](/help-center/roxom-pro/getting-started/linking-windows).

**Aliases:** `MBO`, `DEPTH`, `L2`

  <video autoPlay muted loop playsInline className="w-full" poster="/images/help-center/roxom-pro/clips/ob.jpg" src="/images/help-center/roxom-pro/clips/ob.mp4" aria-label="OB walkthrough: typing BTC-USD OB to open Order Book, then using its main controls">

## How to use OB

| You type | Result |
|---|---|
| `BTC-USD OB` <kbd>ENTER | The bitcoin order book. |
| `MSTR OB` <kbd>ENTER | The MSTR order book. |

## Window menu

Open **▾** in the title bar (or right-click the window) for OB's options:

| Menu item | Shortcut |
|---|---|
| BTC-USD | `1
` |
| BTC-USD | `2
` |
| ETH-USD | `3
` |
| SOL-USD | `4
` |

The menu also has the standard window actions: change function, change security, link, open a copy, zoom and close.

## Plan limits

| | Guest | Free | Pro |
|---|---|---|---|
| The live bid and ask | — | — | ✓ |
| The full order book | — | — | ✓ |

See [Plans and access](/help-center/roxom-pro/getting-started/plans-and-access).

## Related functions

**DOM: Depth of Market**
Bids · buys · price · sells · asks · Δ% ladder

**TAS: Time & Sales**
Equity prints (15m delayed) · crypto perp tape

**Q: Focus**
Single-ticker tape

**TKT: Trade**
Order ticket

## FAQ

**What does OB do?**

    L2 depth.

**How do I open OB?**

    Type `OB` on the command line and press ENTER. To open it in a new window, type `+OB` or press ⇧ENTER. Add a ticker first to load a specific security, for example `BTC-USD OB`.

**Why is the book blurred?**

    The live bid/ask and the full book are Pro features.