Watch Face Format version <button value="5" default="">Version 5</button> <button value="4">Version 4</button> <button value="3">Version 3</button> <button value="2">Version 2</button> <button value="1">Version 1</button>

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When a parent part-based element such as [`PartText`](https://developer.android.com/training/wearables/wff/group/part/text/part-text) is tapped, this element
triggers the launch of an app or app component that's installed on the Wear OS
device.

Introduced in Wear OS 4.

## Syntax

```xml
<Launch target="string">
</Launch>
```

## Attributes

The `Launch` element has one attribute, `target`, that is required. This value
can be one of the following:

- A developer-customized name: Specifies the name of a component that is launched. Prompts user to install from the Play Store if not installed. Specified in the format `com.example.starter` or `com.example.starter/com.example.starter.MainActivity`.
- A deep link, in the format: `app://open.my.app`.
- `ALARM`: The device's default alarm clock app.
- `BATTERY_STATUS`: The battery status screen in system settings.
- `CALENDAR`: The device's default calendar app.
- `HEALTH_HEART_RATE`: The device's default heart-rate-monitor app.
- `MESSAGE`: The device's default text messaging app.
- `MUSIC_PLAYER`: The device's default music player app.
- `PHONE`: The device's default phone app, where users place phone calls.
- `SETTINGS`: The device's system settings.

## Recommended for you

- Note: link text is displayed when JavaScript is off
- [Group](https://developer.android.com/training/wearables/wff/group/group)
- [PartText](https://developer.android.com/training/wearables/wff/group/part/text/part-text)
- [PartText](https://developer.android.com/training/wearables/wff/v2/group/part/text/part-text)