How does the SereniBrain headband improve signal connection stability? The SereniBrain headband has an adjustable, comfortable design that fits most head shapes securely. It uses hydrogel electrodes for improved contact and signal quality, with adjustable side sliders for a better forehead fit. Why does SereniBrain use hydrogel electrodes instead of metal electrodes? Hydrogel electrodes have been tested to offer better conductivity and higher signal quality, with reduced skin impedance. They are also softer, fitting snugly to the skin, enhancing comfort. Does the SereniBrain app require an additional subscription fee? No, it doesn't! SereniBrain offers all features and exercises without extra subscription fees. We are dedicated to continuously upgrading features based on user feedback, with no hidden costs. Does the SereniBrain app allow users to meditate using content other than the built-in audio? Yes, it does, and there's no extra cost! Simply wear the SereniBrain Headband and access the “Meditation Tracker” in the SereniBrain app to use any content you prefer for meditation and generate reports. What are the unique features of SereniBrain in recording and analyzing brainwave data compared to other products? SereniBrain records SMR waves, related to attention and emotion, along with γ, β, α, θ, and δ waves. Our app offers brainwave data with an 80ms max zoom, revealing finer details than the 1000ms zoom of other products.