Beta Brain Waves 20 Hz Concentration, Studying, Alertness, Motivation, Logic Thinking

Beta Brain Wave 20 Hz - Sine 60 Hz

Beta Brain Wave 20 Hz - Sine 80 Hz

Beta Brain Wave 20 Hz - Sine 70 Hz

Beta Brain Wave 20 Hz - Sine 100 Hz

Beta Brain Wave 20 Hz - Sine 110 Hz

Beta Brain Wave 20 Hz - Sine 120 Hz

Beta Brain Wave 20 Hz - Sine 90 Hz

Beta Brain Wave 20 Hz - Sine 150 Hz

Beta Brain Wave 20 Hz - Sine 140 Hz

Beta Brain Wave 20 Hz - Sine 160 Hz