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# VZMemoryBalloonDevice

The common behavior for memory devices.

```
class VZMemoryBalloonDevice
```

## Overview

Don’t instantiate this class directly. To request a memory ballon device, add an appropriate configuration object to the [`memoryBalloonDevices`](/documentation/Virtualization/VZVirtualMachineConfiguration/memoryBalloonDevices) property of the [`VZVirtualMachineConfiguration`](/documentation/Virtualization/VZVirtualMachineConfiguration) object that you use to configure the virtual machine. In response, the system instantiates the subclass of [`VZMemoryBalloonDevice`](/documentation/Virtualization/VZMemoryBalloonDevice) that matches your request. For example, if you supply a [`VZVirtioTraditionalMemoryBalloonDeviceConfiguration`](/documentation/Virtualization/VZVirtioTraditionalMemoryBalloonDeviceConfiguration) object in your configuration, the system creates a [`VZVirtioTraditionalMemoryBalloonDevice`](/documentation/Virtualization/VZVirtioTraditionalMemoryBalloonDevice) object.

---

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