APKPure Appを使用する
Volume BooSterの旧いバージョンをダウンロードすることが可能
携帯電話の音量を制御し、単純な、優れたアプリ（音楽、音声、アラーム、システム）
Simple light-weight app to boost your speaker or headphone sound volume.
Useful for music, movies, and audio books.
Playing audio at high volumes, especially for a prolonged amount of time, can destroy speakers and/or damage hearing. By installing this application you agree that you will not hold its developer responsible for any damage to hardware or hearing, and you are using it at your own risk.
Please note: This app is can't boost volume in phone calls.