1. Natural frequency 7.83 Hz: Our Schumann resonance generator is preset to the standard frequency of 7.83 Hz, harmonizing with Earth's natural resonance. This promotes relaxation of body and mind, enhances quality of life, and evokes a sense of being immersed in nature. 2. quality protective casing: Crafted from durable ABS material and featuring a transparent acrylic dust cover, this Schumann resonance sine wave generator combines aesthetics with practicality. It effectively safeguards the internal precision electronic components against dust and physical damage. 3. Versatile waveform selection: Our frequency generator offers three waveform options—sine wave, square wave, and inverted square wave—to accommodate diverse needs. Whether for relaxation or specialized therapy, you can easily select the most suitable mode. 4. Convenient USB power supply: This Schumann resonance sine wave generator can be powered via a standard USB interface, eliminating the need for an external power source. Enjoy a healthier lifestyle anytime, anywhere—whether at home or while traveling. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.