# Arm Component

This section documents the configuration attributes for each built-in arm model. Use these pages when you are writing a JSON configuration, debugging a config validation error, or looking up the default for a specific attribute.

- For how to add and configure a arm component on your machine, see [Arm](https://docs.viam.com/hardware/common-components/add-an-arm/).
- For the methods you call on a arm in code, see the [Arm API reference](https://docs.viam.com/reference/apis/components/arm/).
- For arm models outside the built-in set, search for `arm` in the [Viam registry](https://app.viam.com/registry). Each registry module’s configuration is documented in its own README on its registry page.

## Built-in models

The following arm models ship with `viam-server`:

| Model | Description |
| --- | --- |
| [`fake`](https://docs.viam.com/reference/components/arm/fake/) | A model used for testing, with no physical hardware.