https://techcrunch.com/2019/11/19/amazons-new-fire-tv-blaster-works-with-echo-to-control-your-tv-soundbar-cable-box-and-more/

Amazon already offers Alexa voice control to TV owners through its Fire TV devices, by way of a voice remote or by pairing an Echo device with a Fire TV, for hands-free voice commands. Now, it’s introducing a new device, the Fire TV Blaster, which extends that same hands-free voice control to your TV itself and other TV devices — like your soundbar, cable box, or A/V Receiver.

That means you’ll be able to say things like “Alexa, turn off the TV,” or “Alexa, switch to HDMI 1 on TV.” You can also control the volume and the playback.