Does work without headphones? mention in "Does work without headphones?" questionAccording to their site, it is preferable and more effective for users to use earbuds or headphones when utilizing, than if they were to use their speakers. They go on to explain that headphones allow you to hear their patented "3D audio enhancements," which are critical to the neuron locking process.

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Music for the brain to improve focus, meditation & sleep

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