A B.I Lightstick. You can use it on your avatar/world/vtuber! See it in-game here: https://vrchat.com/home/launch?worldId=wrld_9c372ca3-2a44-47ba-b43c-bb4145e00962 You need to download VRCFury, Audiolink and Poi Shaders for the Audiolink version to work correctly.