The sound is the system chime tied to fast charging on Samsung's Galaxy S25 Ultra, a flagship Android phone released in 2025. Samsung has long used short, polished notification tones to confirm actions without interrupting the user, and this charging sound follows that pattern. Once clips of it appeared on soundboards, tech reviewers, unboxers and meme editors began reusing it outside the phone itself, as a quick audio shorthand for a device powering up, a battery filling, or a setup going smoothly.