The clip is taken from an internal Android system notification resource labelled for Vivo, listed under the internal notification promote string in device settings. Sounds like this are bundled with phones as default alerts, so they circulate online when users extract and share system tones from their devices. It has since been reused beyond the phone itself as a generic smartphone alert in videos and mock interfaces, where a short branded chime instantly signals a promotion, update, or incoming notification without needing any on-screen explanation or spoken cue to understand it.