1. The use of high-quality materials, the product frequency stability is good; 2. This product can not only output 7.83Hz Schuman wave, but also add programmable frequency modulation technology, which can adjust the frequency in the range of 0.1Hz~30KHz; 3. Digital circuit crystal frequency benchmark, more stable, stronger anti-interference; 4. The power supply interface adopts type-c interface, which is convenient to use. Schuman wave itself is not directly acting on sound or video products to improve the sound quality, but the role of the space environment, so that people's body and mind can be relaxed, improve the body's perception of sound and images, improve the health of the human body work efficiency, relieve psychological pressure also has a good effect. The product can not only output 7.83Hz Schuman wave, but also adjust the frequency in the range of 0.1Hz ~ 30KHz, digital circuit crystal oscillator frequency reference, more stable, stronger anti-interference. Colour:Black Material:Metal + Plastic Package Contents: 1 x Schuman generator 1 x cable Only 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.