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# CGDisplayModelNumber(_:)

Returns the model number of a display monitor.

```
func CGDisplayModelNumber(_ display: CGDirectDisplayID) -> UInt32
```

## Parameters

`display`

The identifier of the display to be accessed.

## Return Value

A model number for the monitor associated with the specified display, or a constant to indicate an exception—see the discussion below.

## Discussion

This function uses I/O Kit to identify the monitor associated with the specified display. The return value depends on the following:

- If I/O Kit can identify the monitor, the product ID code for the monitor is returned.
- If I/O Kit can’t identify the monitor, `kDisplayProductIDGeneric` is returned.
- If no monitor is connected, a value of `0xFFFFFFFF` is returned.

---

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