The DAVID Delight provides a unique fusion of audio-visual entrainment (also known as brainwave entrainment). Using flashing lights and pulsing tones, we can gently and safely guide the brain into various brainwave states. This is commonly known as audio-visual entrainment or brainwave entrainment. These brainwave patterns are typically grouped into four different categories: Beta, Alpha, Theta, and Delta. Each of these brainwave patterns is associated with various states of mind. Beta Waves are quick, low amplitude waves of 14 to 40 times per second (Hz). Beta brainwave patterns are generated naturally when in an awake, focused and alert state of consciousness. Alpha Waves are between 8 and 13 Hz and occur during sensorial rest (eg. when the eyes are closed), intellectual relaxation, deep relaxation or meditation. Alpha brainwave rhythms produce: peaceful feelings, warm hands, and feet, a sense of well-being, improved sleep, improved academic performance, increased productivity in the workplace, reduced anxiety and improved immune functioning.