The sound comes from Huawei phones and tablets released from 2021 onward, where it serves as the system low battery warning under HarmonyOS. The same alert is also heard on some non-Huawei devices running HarmonyOS, which helped the tone spread beyond a single brand of handset. As short phone sounds became popular clips for edits and soundboards, this chime was shared for its clear meaning, anyone hearing it understands a device is about to shut down without needing any on-screen explanation or dialogue.