1. Adopting high-quality materials, the product has good frequency stability;2. This product can not only output 7.83Hz Schumann resonances wave, but also add programmable frequency modulation technology, which can adjust the frequency in the range of 0.01Hz to 100000Hz;3. Digital circuit crystal oscillator frequency reference, more stable and more anti-interference;4. The power interface adopts a DC5.5 * 2.1 interface, which is convenient to use. The USB end can be plugged into the power bank, USB charging head, or other USB powered devices to work.Schumann resonances itself does not directly act on sound or video products to improve the sound quality, but on the space environment, which can relax the body and mind, improve the body's perception of sound and images, improve the health work efficiency of the human body, and relieve Psychological stress. This product can not only output 7.83Hz Schumann resonances wave, but also adjust the frequency in the range of 0.01Hz~100KHz. The digital circuit crystal oscillator frequency reference is more stable and more anti-interference.Green standard version:Circuit board size: 15 x 15cmAntenna waveform: sine waveInterface waveform: sine wave+square wave+inverse square wave (the bottom left corner is the output interface, and the waveform is output simultaneously)Power supply interface: DC5.5 * 2.1Power supply voltage: 5VRated power consumption:Less than 1WDefault frequency: 7.83HzAdjustment range: 0.01Hz~100000HzSinusoidal signal voltage amplitude: 3VSquare wave signal voltage amplitude: 5VChange frequency :Directly input the frequency and press the bottom left button to complete the settingFor example, by pressing [7] [.] [8] [3] and then [OK], you can set the default power on output to 7.83Hz, with a range of 0.01Hz~100KHzColour:greenMaterial:PCBPackage Contents:1 x Schumann resonances wave generator1 x USB 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.