> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.onesignal.com/llms.txt
> Use this file to discover all available pages before exploring further.

# watchOS & Wear OS Support

> Complete guide to implementing OneSignal push notifications for standalone Apple watchOS and Android Wear OS applications, including setup instructions and API integration.

## Apple watchOS Setup

OneSignal supports push notifications for Apple Watch apps in two ways: synced notifications from paired iOS apps and standalone watchOS app implementations.

### Synced Notifications

When an iOS mobile app is synced to a watchOS app, notifications sent to the iPhone will automatically appear on the paired Apple Watch.

### Standalone watchOS Implementation

For standalone watchOS apps, you can implement push notifications independently. While OneSignal doesn't provide a dedicated SDK for standalone watchOS apps, you can integrate using the following approach:

<Steps>
  <Step title="Register for Remote Notifications">
    Implement the Apple WatchKit `WKExtension` with the `registerForRemoteNotifications` [method](https://developer.apple.com/documentation/watchkit/wkextension/3141920-registerforremotenotifications?language=objc). This generates the APNs push token specifically for the watch device.
  </Step>

  <Step title="Handle Token Registration">
    Set up the `WKExtensionDelegate` to capture the APNs push token using the `didRegisterForRemoteNotificationsWithDeviceToken` [method](https://developer.apple.com/documentation/watchkit/wkextensiondelegate/3141924-didregisterforremotenotification?language=objc).
  </Step>

  <Step title="Register Device with OneSignal">
    Create the subscription in OneSignal using the [Add a device](/reference/add-a-device) API with these required properties:

    **Required Parameters:**

    * `identifier`: The APNs push token generated by the watch
    * `device_type`: Set to `0` for iOS devices
    * `external_user_id`: Unique identifier for the user who owns this subscription

    **Optional Parameters:**

    * `test_type`: Required only when testing on development or ad-hoc builds
    * Additional properties as needed for your implementation
  </Step>

  <Step title="Send Notifications">
    Once the device is registered, you can send push notifications directly to the watch through OneSignal's dashboard or API.
  </Step>
</Steps>

***

## Android Wear OS Setup

The OneSignal Android Native SDK is fully compatible with Android Wear OS applications, providing seamless integration without additional configuration.

### Custom Notifications

You can enhance the watch experience by building:

* Custom notification layouts optimized for wearable displays
* Wearable-specific actions and interactions
* Watch-only notification behaviors

Follow the official Android Developer [Notifications on Wear OS](https://developer.android.com/training/wearables/notifications) documentation for detailed implementation guidance on creating rich, interactive notifications tailored for wearable devices.

### Implementation Notes

* Use the same OneSignal Android SDK as mobile apps
* No additional setup required for basic functionality
* Custom layouts and actions require standard Android Wear OS development practices

***