# Device
## Device Attributes
Describes device attributes.
| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| `device.id` | string | A unique identifier representing the device [1] | `123456789012345`; `01:23:45:67:89:AB` |  |
| `device.manufacturer` | string | The name of the device manufacturer [2] | `Apple`; `Samsung` |  |
| `device.model.identifier` | string | The model identifier for the device [3] | `iPhone3,4`; `SM-G920F` |  |
| `device.model.name` | string | The marketing name for the device model [4] | `iPhone 6s Plus`; `Samsung Galaxy S6` |  |
**[1] `device.id`:** Its value SHOULD be identical for all apps on a device and it SHOULD NOT change if an app is uninstalled and re-installed.
However, it might be resettable by the user for all apps on a device.
Hardware IDs (e.g. vendor-specific serial number, IMEI or MAC address) MAY be used as values.
More information about Android identifier best practices can be found [here](https://developer.android.com/training/articles/user-data-ids).
> [!WARNING]
>
> This attribute may contain sensitive (PII) information. Caution should be taken when storing personal data or anything which can identify a user. GDPR and data protection laws may apply,
> ensure you do your own due diligence.
>
> Due to these reasons, this identifier is not recommended for consumer applications and will likely result in rejection from both Google Play and App Store.
> However, it may be appropriate for specific enterprise scenarios, such as kiosk devices or enterprise-managed devices, with appropriate compliance clearance.
> Any instrumentation providing this identifier MUST implement it as an opt-in feature.
>
> See [`app.installation.id`](/docs/registry/attributes/app.md#app-installation-id) for a more privacy-preserving alternative.
**[2] `device.manufacturer`:** The Android OS provides this field via [Build](https://developer.android.com/reference/android/os/Build#MANUFACTURER). iOS apps SHOULD hardcode the value `Apple`.
**[3] `device.model.identifier`:** It's recommended this value represents a machine-readable version of the model identifier rather than the market or consumer-friendly name of the device.
**[4] `device.model.name`:** It's recommended this value represents a human-readable version of the device model rather than a machine-readable alternative.