Bonfire sound only.60 min version. Relaxation effect can be expected in the natural environment with the fluctuation of sound 1 / f, work efficiency, good night's sleep effectiveness, and improve your concentration can be expected. Expected up concentration, the effect sound sleep, stress, good sleep effect, healing, relaxing sound effects as well as the natural environment. I was like a long time to be able to play video in various ways for work sounds, sounds for reading, sounds for sleep onset, and sounds for the study. I recommend this for those who want to improve the quality of sleep or who want to increase the work efficiency. Music to help Study and Work.Help falling asleep. You can get focused and relaxing when you listen this Chill Out Music!