On the Mac, you can click on the Siri app icon on the dock or the menu bar ... Apple TV‌, hold down the Siri button on the remote (the button with the microphone) to activate Siri.

The Siri Remote is the main accessory for the Apple TV. While Apple’s set-top box hasn’t changed much over the years, the Siri Remote has gone through multiple iterations. The Siri Remote ...

If you have a Siri Remote, plug it into a Lightning or USB ... To do this, press and hold the TV button (Control Center icon) and the Volume Down button together for about 5 seconds, then release ...