This product is a 7.83 Hz low frequency waves generator featuring high accuracy and stability. electromagnetic waves are low frequency and can penetrate any material. Each individual has a network of weak currents that produce frequency resonances when excited by waves. The overall equilibrium of the human meridians is maintained by receiving the electromagnetic field and the cellular frequency resonance of the human body to reduce the damage caused to the human body by the EMF ionizing radiation. Human frequency resonances can be induced, complementing natural geomagnetic and artificially attenuated electromagnetic field (EMF) interference, and equilibrating the membrane potential equilibrium. The waves generator itself does not make any sound, and it is not directly acting on the sound or video products to improve the quality of sound or vision, but it plays a role in the space environment, it can help relax people's physical and mental, and it helps improve the body's perception of sound and imaging, and it also helps the human body more healthier to improve the work efficiency. Name: Resonance Generator Power: 5W Frequency: 7.83Hz Input power: 5V Interface: USB Colour:As Shown Material:plastic Specification: B:without housing Package Contents: 1 x Resonance Generator 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.