Usage Tips:Advanced Frequency Adjustment: Experience the precision of our Schumann Waves Resonance Generator, capable of ultra-low frequency adjustments ranging from 0.01Hz to 30000Hz. This wide range allows for tailored sound experiences suitable for various applications and environments.High-Quality Sine Wave Production: Our generator produces a clean and stable sine wave, ensuring high fidelity and consistency in the frequencies generated, perfect for audio experiments and resonance therapy.Working voltage: DC 5V (DC 4-15V)Working current: 8-14MAPower interface: Type-c (supports Type-c to Type-c power supply)Default frequency: 7.83HzAdjustment range: 0.01Hz-100000Hz pure sine waveSignal voltage amplitude: 3VDue to different batches, there may be differences in product appearance and printed text, which will not affect useColour: greenMaterial: PCBPackage Contents:1 x Schumann Wave GeneratorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.