SchumannWave acts on the space environment. This product can output 7.83Hz SchumannWave, and adjust the frequency in the range of 0.001Hz-200KHz, with digital circuit crystal oscillator frequency reference. Features: This product can output 7.83Hz SchumannWave, and adds programmable frequency modulation technology, which can adjust the frequency within the range of 0.001Hz-200KHz. Professional oscilloscope measurement, 7.83Hz standard sinewave. Digital circuit crystal oscillator frequency reference. The power supply interface adopts DC5.5*2.1 interface, and the USB can be plugged into the power banks or USB charging head or other USB power supply equipment to work. Specifications: Circuit board size: 150 * 150mm 5.9 * 5.9in Antenna Waveform: sinewave Interface waveform: sinewave + squarewave + inverted squarewave (the lower left corner is the output interface, and the waveform is output at the same time) Power Supply interface: DC5.5*2.1 Voltage: 5V Rated power consumption: less than 1W Default frequency: 7.83Hz Adjustment range: 0.001Hz-200KHz Sine Signal voltage amplitude: 3V Square Wave 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 left corner 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 power banks or USB charging head or other USB power supply equipment to work. Packing List: 1 * SchumanWave Generator 1 * USB Cable