The oxygen listening app was an online reading app. Its main function was to allow readers to simulate the effect of listening to books by using oxygen while reading novels. After the black screen, the oxygen listening program would stop running and stop playing the content of the novel. This was because after the black screen, the oxygen listening book could not receive the content of the novel and could not continue to play. Therefore, in order to ensure the readers 'reading experience, they would stop playing the content of the novel.