AirPlay on Apple Devices
All Apple devices made within the last few years have AirPlay support. On an iPhone or iPad, simply swipe up from the bottom of the screen and navigate to the “Now Playing” screen and select the AppleTV labeled for your room.
On a Macbook or Macbook Pro, select the “Mirroring” icon from the menu in the top-right of the screen and select the AppleTV labeled for your room.
After you are finished wirelessly displaying, it may be necessary to navigate back and select your device’s internal display.
WiDi/Miracast on Windows 8, 8.1, 10
Many Windows PCs support WiDi or Miracast (they are essentially the same thing) however not all devices are compatible. For example, 2013 and up model Samsung phones support Miracast, but some LG and Google phones do not.
To see if your Android phone supports Miracast, swipe down on the home screen and look for “Screen Mirroring” as an option.
To connect to a wireless display using a PC laptop, refer to the instructions here from Microsoft.