Applicable XR devices This guidance helps you build experiences for these types of XR devices. [Learn about XR device types →](https://developer.android.com/develop/xr/devices)  Audio \& Display Glasses [](https://developer.android.com/develop/xr/devices#audio-display) [Learn about XR device types →](https://developer.android.com/develop/xr/devices)
After you've learned the basics for [creating an activity for audio glasses and display glasses](https://developer.android.com/develop/xr/jetpack-xr-sdk/glasses/first-activity), you can take advantage of the unique hardware available on the glasses, such as the camera. Accessing the hardware on audio glasses and display glasses lets you build more helpful and connected experiences. There are many scenarios where your app might want to use the hardware on a user's audio glasses or display glasses. For example, a video conferencing app could add a UI control that allows the user to switch their video stream from the phone's camera to the glasses' camera, offering a first-person point of view. This guide explains the following areas: - [Requesting hardware permissions](https://developer.android.com/develop/xr/jetpack-xr-sdk/request-hardware-permissions) - [Using a projected context to access hardware on audio glasses and display glasses](https://developer.android.com/develop/xr/jetpack-xr-sdk/access-hardware-projected-context) This guide assumes you're familiar with the following concepts: - [Permissions](https://developer.android.com/guide/topics/permissions/overview)