$5
This MP3 contains frequencies which will greatly increase Mental Energy, and remove "Brain Fog".
One practical application of this is to listen right after a long meditation to regain focus and awareness.
This track is also excellent for Study / Work focus improvement.
The following frequencies are contained in this MP3:
40 Hz
Binaural Beats
Brain Operating System Frequency
13 Hz
Monaural Beats
Focus / Concentration
90 Minute MP3