### [Wear OS 5](http://developer.android.com/training/wearables/versions/5/changes)

Prepare your apps for the latest version of Wear OS. Learn about behavior changes in Wear OS 5 and discover how you can further enhance your app's user experience.  
[Prepare your app](http://developer.android.com/training/wearables/versions/5/changes)[Explore features](http://developer.android.com/training/wearables/versions/5/features)[mobile_friendly](http://developer.android.com/training/wearables/get-started/creating#configure-emulator)  

### [Test your app](http://developer.android.com/training/wearables/get-started/creating#configure-emulator)

Explore how your app behaves on Wear OS 5. Install and test your app on an emulator or device that runs Wear OS 5, including the Google Pixel Watch 3!  
[Set up the emulator](http://developer.android.com/training/wearables/get-started/creating#configure-emulator)[Install on device](http://developer.android.com/training/wearables/get-started/creating#run-watch)

## What's in Wear OS 5

power  

### Power optimizations

The latest version of Wear OS includes several updates and optimizations to help your app run as smoothly as possible in a more power-efficient way.  
mobile_friendly  

### Support for different screen sizes

Wear OS 5 includes features that improve system navigation experiences on devices that contain larger displays. In particular, Wear OS 5 supports a denser app selection screen.  
watch  

### Updates to Watch Face Format

Bring your creative vision even more to life using an updated version of Watch Face Format. Integrate additional types of complications and data expressions to enrich your watch face experience.