Overview： Schumann wave itself is not a direct role in the sound or video products to improve sound quality, but the role of the spatial environment, so that people's physical and mental relaxation, improve the body's perception of sound and images, improve the human body's health work efficiency, relieve psychological stress also has a better effect. The product can not only output 7.83Hz Schumann wave, but also can be adjusted in the range of 0.1Hz ~ 30KHz frequency, digital circuit crystal oscillator frequency reference, more stable, stronger anti-interference. Features： 1. Adopting high quality materials, the product has good frequency stability; 2. This product not only can output 7.83Hz Schumann wave, but also added programmable frequency tuning technology, can be adjusted in the range of 0.1Hz~30KHz frequency; 3. There are 2 kinds of specifications can be selected according to the demand, green models only sine output, black board models support sine wave, square wave, inverted square wave a variety of waveforms, can be selected according to the demand; 4. Digital circuit crystal frequency reference, more stable, stronger anti-interference; 5. Power supply interface using DC5.5 * 2.1 or Micro USB interface, easy to use, the USB end plugged into the rechargeable treasure or USB charging head or other USB-powered devices can work. Specification： Black standard model: Antenna waveform: sine wave Interface waveform: sine wave + square wave + inverted square wave (the lower left corner is the output interface, waveform output at the same time) Power supply interface: DC5.5*2.1 Supply voltage: 5V Rated power consumption: <1W Default frequency: 7.83Hz Adjustment range: 0.1Hz~30000Hz Sine signal voltage amplitude: 3V Square wave signal voltage amplitude:5V Circuit board size: about 15*14CM With shell size: about 15.5*14.5*2.8CM Green Version: Antenna Waveform:Sine Interface waveform: sine wave Power supply interface: Micro USB Supply Voltage:5V Rated Power Consumption:<1W Default Frequency:7.83Hz Adjustment range:0.1Hz~30000Hz Sine signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V Circuit board size: about 15*10CM Size with case: about 15.5*10.5*2.8CM Change frequency method. Input the frequency directly, press the lower-left key, you can complete the setup. For example, press [7][...]. [8][3], and then press [OK], you can set to 7.83Hz default power output 7.83Hz, set the range 0.1~30KHz. Using Methods. Take out the USB cable with the product, connect and plug it into the circuit board, and plug the USB end into the rechargeable treasure or USB charging head or other USB powered devices to work. List： 1 x Schumann Wave Generator (with case/without case optional) 1 x USB cable