Neck-Hook Earphone Player with Built-in Gamma Meditation Music and Waves

GammaDuo – 40 Hz Sound Entrainment & Meditation Headset The GammaDuo is an ultra-lightweight, behind-the-ear headset designed for deep focus, mindfulness, and relaxation through precisely tuned 40 Hz sound frequencies. Unlike ordinary background or relaxation music, GammaDuo delivers stable and accurate 40 Hz audio that supports concentration, clarity, and a balanced state of mind. With a full-range 20 Hz–20 kHz sound response and true independent stereo channels, it creates a clear and immersive listening field across the entire spectrum.The headset includes multiple built-in sound programs—from rhythmic pulse tones to ambient gamma-infused soundscapes—so you can enjoy authentic 40 Hz experiences anywhere, anytime, without relying on external devices or apps. Included Audio Programs (Pre-Installed) 40 Hz Pulse Entrainment – Classic: rhythmic tone pattern inspired by cognitive-audio studies 40 Hz Pulse Entrainment – Gentle: softened version for calm or extended use 40 Hz / 43