1. Schumann wave electromagnetic waves are extremely low frequency, can penetrate any material, and are non-free radiation. 2. Schumann wave is a natural energy source, inexhaustible, and anyone who easily resonates with Schumann wave will gain energy, naturally be full of energy and healthy. 3. By resonating the received Schumann wave electromagnetic field with the frequency of human cells, the overall balance of human meridians is maintained, thereby reducing the harm of EMF free radiation to the human body. 4. When simulating the natural regenerative magnetic field electronically, such as using a square wave generator to generate an artificial 7.83Hz Schumann wave frequency to replace the natural Schumann wave. 5. The generator can induce human frequency resonance, supplement the natural geomagnetic field and artificially weaken the electromagnetic field EMF interference, so that the cell membrane potential is balanced and healthy. Specifications: Project Type: Schumann Wave Generator Power Supply: Built-in lithium battery-USB charging, with 4 battery indicator lights Power Consumption: 5V 0.08A Working Frequency: 7.83Hz, sine wave generated by a programmable smart chip. Waveform, frequency and power can be set (fixed by default). Higher frequency accuracy and stability consistency. Another USB-A for external 5V power supply Dimensions: 80 x 76 x 24 mm / 3.15 x 2.99 x 0.94 inches Color: White Material: PU+Plastic Package Contents: 1 x Schumann Wave Generator 1 x USB Cable Only the above package contents, other products are not included. Note: Light and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3 cm.