Long Battery Life - Built-in battery with a full charge in 3 hours - Enjoy a working time of 20-48 hours on a single charge User Friendly - On/off operation requires no online setup - Low battery warning alerts you when it needs charging Customizable Timer Settings - Easy to customize relaxation sessions - Timer options: 30 minutes, 60 minutes, or 90 minutes - Automatically turns off after the selected interval for convenience and energy efficiency High Quality Audio Experience - Realistic sound with white noise and high audio fidelity - Creates a calm, quiet environment for focused relaxation or sleep Use scenarios - Sleep support: use before bed to mask ambient noise and promote easier, deeper sleep - Focus sessions: use during study or work to block distractions and improve concentration - Travel comfort: use on commutes or flights to reduce cabin noise and help you relax This device is designed to be simple to use, reliable, and efficient, delivering a steady white-noise audio experience with minimal setup and easy power management.