A slightly different frequency is played in each ear. The brain perceives the difference as a rhythmic beat. For example, 200Hz in left ear + 210Hz in right = 10Hz beat.
Different beat frequencies target different mental states: Delta (1-4Hz) for deep sleep, Theta (4-8Hz) for meditation, Alpha (8-13Hz) for relaxation, Beta (13-30Hz) for focus.
Yes, each ear must receive a different frequency.
Research is mixed, but many users report benefits.
Yes, add white noise or nature sounds.
15-30 minutes for best results.
Yes, unlimited streaming.