This product is a Schumann 8.3 Hz very low frequency generator featuring high accuracy and stability. High stable frequency acquisition elements: high stability pulse chip, precision correction capacitance, precision multi-loop adjustable resistor. High quality polymer batteries with overcharge, overvoltage, and overcurrent protection. There is almost no voltage ripple in the voltage supply. Equipped with a work toggle switch for easy operation. Schumann wave may be used in audio environments or for sleep support. Power: 12V 1A Android charging cable Polymer battery capacity: 2300 mAh Working time: up to 200 days on a full charge The Schumann wave does not directly act on audio or video devices to improve sound or image quality. Instead, it may influence the surrounding environment and contribute to mental and physical relaxation, potentially enhancing the body's perception of sound and images, supporting overall well-being, and helping reduce mental stress. For sleep application: 1. Recommended for trial use placed on a bedside table, at least 1 meter away from the body. 2. During trial, apply appropriate anti-vibration measures. 3. Use a cloth or paper to cover the indicator light and block light emission at night. 4. Test for one week and evaluate the experience over the seven-day period. Color: Gold Material: Plastic Package Contents: 1 x Schumann Wave Generator 1 x USB Cable Only the above package content is included; other items are not part of this package. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.