Xiaomi is a major smartphone maker whose phones ship with a set of short, distinctive notification tones, and louder, boosted versions of those alerts are widely shared on soundboards for use outside the phone itself. Because the tone is short and instantly recognisable to anyone who has used an Android phone, it works as a shorthand for a message arriving, even in clips where no phone is shown. That familiarity keeps it in circulation for pranks, edits and reaction videos, where a single familiar chime can sell a joke without any explanation.