All Chromecast devices require a TV with High-bandwidth Digital Content Protection (HDCP) 1.3 or higher built-in. HDCP 2.2 is required to support 4K content. Most televisions that are five years old or newer and have HDMI ports will have at least one port that supports HDCP 2.2.
Setup essentials
A display device with Chromecast built-in
Access to an available power outlet or an available (non-service) USB port on your HDMI-enabled display
Access to a secure wireless network (make sure you have the wireless network password handy)
A compatible Android or iOS device or tablet
Plugging your Chromecast into your TV's HDMI port and a power source, then installing the Google Home mobile app on your mobile device to begin the setup process, and following the app's setup instructions.
Cast your Android screen from the Google Home app
Casting your Android screen lets you mirror your Android device to the TV so you can enjoy your content exactly as you see it on your mobile device—only bigger.
Step 1. Get started
Casting your Android screen is available on devices running Android 5.0 or later.
Casting your Android screen is not supported on iOS or Windows devices.
Turn off "Power Saving Mode" on your Android device. Power Saving Mode can limit the processing power of your device which might affect the performance of the Cast Screen feature.
Important： The "Microphone" permission in the Google Play Services app needs to be turned on to successfully use the "Cast Screen / Audio" feature with Chromecast. If you don't have this permission turned on, the Cast Screen session will immediately disconnect after trying to connect.
To turn on microphone permissions:
On your Android device, tap Settings 。
Scroll down and tap Apps Google Play Services Permissions.
Look for "Microphone" and slide the slider On .
Step 2. Cast your screen from your Android device
Make sure your mobile phone or tablet is on the same Wi-Fi network as your Chromecast device.
Open the Google Home app 。
Tap the device you want to cast your screen to.
Tap Cast my screen Cast screen.
Step 3. Adjust the volume when casting your Android screen
Open the Google Home app 。
Tap your device, then adjust the volume.
Step 4. Stop casting your screen from your Android device
From the Google Home app
Make sure your mobile phone or tablet is on the same Wi-Fi network as your Chromecast device.
Open the Google Home app .
Tap your device Stop mirroring .
AirPlay 2 / Apple HomeKit settings on your TV and Smart Monitor
You can adjust a few AirPlay 2 settings directly on your TV and Smart Monitor. Just navigate to Settings, select General, and then select Apple AirPlay Settings.
AirPlay: Selecting this option will turn the AirPlay feature on.
or
Press (Input select) button on the TV remote control, select (AirPlay).
Mirror your iPhone, iPad, or iPod touch to a TV
Connect your iPhone, iPad, or iPod touch to the same Wi-Fi network as your Apple TV or AirPlay 2-compatible smart TV.
Open Control Center:
On iPhone X or later or iPad with iPadOS 13 or later: Swipe down from the upper-right corner of the screen.
On iPhone 8 or earlier or iOS 11 or earlier: Swipe up from the bottom edge of the screen.
Tap Screen Mirroring.
Select your Apple TV or AirPlay 2-compatible smart TV from the list.
If an AirPlay passcode appears on your TV screen, enter the passcode on your iOS or iPadOS device.
To stop mirroring your iOS or iPadOS device, open Control Center, tap Screen Mirroring, then tap Stop Mirroring. Or press the Menu button on your Apple TV Remote.
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Android device
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Google Play Services 
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(Input select) button on the TV remote control, select 
(AirPlay).
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