The Radio is a gamepass item that allows you to play audio contained in the Roblox Library by copying and pasting the audio's ID. It has a Play/Pause and Stop button, a built-in playlist, and a volume slider. The Radio has an additional gamepass that enhances its customizability, known as the Radio Mixer, which gives you various sliders to modify the audio. The Radio Mixer is often used by nefarious players to play loud/obnoxious audio (also known as "earrape"). When the "Mute Radio" button is pressed, all radios will be silenced except for your's.
Tip: If you want to find audio to play on your radio, go to this page: roblox.com/develop/library