The "시간제한 없는 녹음기 mp3플레이어 파일관리어플" is a free Android multimedia application developed by fountsam. It is a voice recorder that allows you to record audio in mp4 format without any time limit. Additionally, it features a music player that can play various audio files such as mp3, mp4, amr, m4a, mid, 3gp, ogg, mid, flac, among others. The app also includes a simple file explorer that allows you to manage your audio files, including the ability to move, delete, copy, and rename them.

Moreover, the app has a feature that enables you to listen to audio files temporarily without moving or copying them. It also comes with seven different background themes to choose from to avoid boredom. The app is user-friendly and straightforward, making it a suitable option for older adults or those who are not familiar with smartphone usage. This app is ideal for college students, professionals, or anyone who needs to record lectures, meetings, or speeches. Please note that the app was last upgraded on January 24, 2017, and the developer's contact information is not provided.