|
|
|
|
|
|
by tkanarsky
357 days ago
|
|
|
The official Blackpink (kpop group) light sticks from one of their tours have this functionality built in. The annoying part is that one of their Spotify albums have this 18-20khz control track present, and (when I was younger) I could hear it and it annoyed the heck out of me. |
|
|