Features: brand new and high quality Schumann wave electromagnetic wave is extremely low frequency, can penetrate any substance, is non-free radiation. Schumann wave is a natural energy source, and it is inexhaustible. Anyone who is easy to resonate with Schumann wave is for always obtain energy, and the natural spirits is full and healthy. Through the resonance of the accepted Schumann wave electromagnetic field and the cell frequency of the human body, the overall balance of the human is maintained, thereby reducing the damage caused by EMF-free radiation. When the natural regenerative magnetic field is simulated by electronic means, such as using a wave generator to generate an artificial 7.83 Hz Schumann wave frequency instead of a natural Schumann wave. The generator can induces human body frequency resonance, supplement natural geomagnetism and artificially weaken electromagnetic field EMFinterference, and make cell membrane potential balance for health. Specifications: Item Type:Schumann Wave Generator Power Supply:Built-In Lithium Battery Micro USB Charging,with 4 Light Battery Display Power Consumption:5V 0.08A Working Frequency:7.83Hz, a sine wave is generated by a programmable intelligent 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 Size: approx. 80x76x24mm /3.15x2.99x0.94in Package Includes: 1 x Generator 1 x Power Adapter note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!