Phasmophobia, the cooperative ghost-hunting game from Kinetic Games, gives players an EMF reader to detect electromagnetic activity, and a level 5 reading is the strongest result and a piece of evidence toward identifying the ghost. The reader's frantic electronic tone became familiar through livestreams, gameplay highlights and short horror edits, where viewers learned to recognise it as a warning that a hunt or encounter was close. It remains popular because the sound alone signals rising danger without any dialogue or explanation.