Pure sine wave output: Unlike ordinary square wave generators, this device uses pure sine wave technology, resulting in a smoother waveform, better performance, and gentler on the human body. Built-in high-capacity battery: Equipped with a 2000mAh lithium battery, supporting long-lasting use and allowing for continuous plug-in use without affecting battery life. Type-C universal interface: Uses the mainstream Type-C interface, supporting power from mobile phone chargers, power banks, and computer USB ports for convenient charging. Noise-free design: The device operates without any sound or mechanical fan, ensuring quiet and undisturbed operation. Portable and compact: Small in size, space-saving, and easy to carry. Product Name: 7.83Hz Schumann Wave Extremely Low Frequency Signal Generator Product Aliases: Tesla Wave Generator / Schumann Wave Resonator Operating Frequency: 7.83Hz Extremely Low Frequency Electromagnetic Wave Output Power: 0.3mW Waveform: Pure Sine Wave Power Supply Voltage: 5V/2A Interface Type: Type-C Battery Capacity: 3.7V 2000mAh Lithium Battery Charging Method: Type-C interface, can be used with a universal mobile phone charger, current unlimited Applicable Scenarios: This product does not emit any sound, but only acts on the spatial environment through electromagnetic fields. It is suitable for the following scenarios: Bedroom: Stimulates deep sleep, treats insomnia, and helps relax the mind and body. Office: Relieves work stress and improves work efficiency. Creative Space: Enhances creative inspiration and helps artists and writers enter a state of flow. Audiovisual Space: Improves sound field and audiovisual effects, stabilizes reverberation in the sound system, and allows listeners to enjoy music more attentively and pleasantly. Tea Ceremony, Spiritual Meditation, and Zen Meditation Space: Nourishes the mind and body and enhances the depth of meditation. Color: White Material: plastic Package Contents: 1 * Schumann wave generator 1 * Type-