You can pair an Alexa-compatible remote with your Echo by using the Alexa app on a mobile device.
Fire TV Alexa Voice Remote Pro Review: An Unnecessary Upgrade - CNET
Echo Show 15 with Fire TV hands-on: 's largest smart display can now double as a TV - The Verge
How to pair or reset your Fire TV Stick remote - Android Authority
Echo Show 15, Full HD 15.6 smart display with Alexa and Fire TV built in
How to connect and pair a Fire TV Alexa Voice Remote to the Echo Show 15
How to use your Echo as a Bluetooth speaker
How to Pair an Alexa Remote With an Echo
How to connect Echo Show 15 to Alexa Voice Remote 3rd Gen?
COMPATIBILITY: Remote Plus V2 is only compatible with Alexa Voice Remote (3rd Gen). PRIVATE LISTENING: Plug headphones into the Remote Plus V2 audio
Alexa Voice Remote (3rd Gen) with TV controls, Requires compatible Fire TV device, 2021 release
How to pair your Echo with a Bluetooth Speaker - CNET
How to connect a remote to Echo Show 15