In Duelist PvP on Roblox PC, “radio” usually means using voice chat or in-game voice communication. Roblox voice chat is only available if your account is 13+ , age-verified, and voice chat is enabled in your Roblox privacy settings.

How to turn it on

  1. Open Roblox Settings.
  2. Go to Privacy or Communication.
  3. Turn on Voice Chat / Enable Microphone.
  4. Make sure your PC microphone permission is allowed in Windows or your browser/app settings.

In Duelist PvP

  • Join a server that supports voice chat.
  • Look for the mic icon above players or in the lobby.
  • Use your microphone normally once you’re in-game.

If it is not working

  • Check that your mic is selected correctly.
  • Restart Roblox after enabling permissions.
  • Confirm the game actually supports voice chat.
  • Make sure your age verification is complete, since the toggle won’t fully work otherwise.

Quick scoop: if you meant a different “radio” feature inside Duelist PvP, the public guides I found don’t clearly document a separate radio command or menu, so the safest answer is that players usually mean Roblox voice chat here.