Feature: 1. Using fine quality materials, the frequency stability of the product is fine. 2. This product can not only output 7.83Hz SchumannWave, but also adds programmable frequency modulation technology, which can adjust the frequency within the range of 0.001Hz-200KHz. 3. Professional oscilloscope measuremen, 7.83Hz standard sinewave, Waveform is real and effective. 4. Digital circuit crystal oscillator frequency reference, more stable and strong anti-interference. 5. The powersupply interface adopts DC5.5*2.1 interface, which is easy to use, and the USB can be plugged into the powerbanks or USB charginghead or other USB powersupply equipment to work. Specification: SchumannWave itself does not act directly on sound or video products to improve sound quality, but on the space environment, which can relax people's body and mind, improve the body's perception of sound andimages, improve thehealth of the human body and work efficiency, and relieve psychological pressure. This product not only can output 7.83Hz SchumannWave, but also can adjust the frequency in the range of 0.001Hz-200KHz, the digital circuit crystal oscillator frequency reference, more stable and strong anti-interference. Features: Using fine quality materials, the frequency stability of the product is fine. This product can not only output 7.83Hz SchumannWave, but also adds programmable frequency modulation technology, which can adjust the frequency within the range of 0.001Hz-200KHz. Professional oscilloscope measuremen, 7.83Hz standard sinewave, Waveform is real and effective. Digital circuit crystal oscillator frequency reference, more stable and strong anti-interference. The powersupply interface adopts DC5.5*2.1 interface, which is easy to use, and the USB can be plugged into the powerbanks or USB charginghead or other USB powersupply equipment to work. Specifications: Circuit board size: 150 * 150mm / 5.9 * 5.9in AntennaWaveform: sinewave Interface waveform: sinewave + squarewave + inverted squarewave (the lower leftcorner is the output interface, and the waveform is output at the same time) PowerSupply interface: DC5.5*2.1 Voltage: 5V Rated power consumption: <1W Default frequency: 7.83Hz Adjustment range: 0.001Hz-200KHz SineSignal voltage amplitude: 3V SquareWave signal voltage amplitude: 5V Package size: 160 * 160 * 40mm / 6.3 * 6.3 * 1.6in Package weight: 200g / 7.1ounce How to change the frequency: Enter the frequency directly, press the button on the lower leftcorner to complete the setting. For example, press [7][.][8][3], then press [OK], you can set to 7.83Hz, the default power-on output is 7.83Hz, and the setting range is 0.001Hz-200KHz. Instructions: Take out the USB cable that comes with the product, connect the round hole end to the circuit board, and plug the USB into the powerbanks or USB charginghead or other USB powersupply equipment to work. Packing List: 1 * SchumanWave Generator 1 * USB Cable Package List: 1 * SchumanWave Generator 1 * USB Cable