It's the JBL Connect app on android. First install the app / update it to the newest version via the play store. edit: this is the app https://play.google.com/store/apps/detai...
Connect your phone via bluetooth with the box. If the app then prompts you to do a firmware update, plug the box in an outlet to charge and do that, this takes a while.
When everything is up to date you should see your box on the main screen of the app like here https://imgur.com/LaUcEkL.jpg
if you don't see that try to restart the app, and make sure your phone is still connected to the box.
Then tap on the grey gear on the bottom, and disable the option "audio feedback sounds".
This worked for my charge 3, hopefully it's the same for your version. If you have iOS it should be similar, but I don't know the exact details... I hope this helps :)
IT WORKSç Thank yu JH