Description: wave itself is not directly acting on the sound or video products to improve the quality of sound quality, but the role of the space environment, people's physical and mental relaxation, improve the body's perception of sound and images, improve the health of the human body to improve the efficiency of work, mental stress also have a better effect. This product is wave 7.83HZ very low frequency generator, features high accuracy and stability. High stable frequency acquisition elements: high stability chip, precision correction capacitance, precision multi-loop adjustable resistor For audio-visual space to enhance the sound field and audio-visual effects For the bedroom - to help sleep soothe the nerves,For the office - relax and improve work efficiency ; For the create space - to improve creative inspiration ; For the tea ceremony, spirituality, realization space - resting body and mind Specification: Frequency: 7.83Hz Power: 0.3mW Built-in 2000mAh lithium battery Size Chart: 100x100mm Package Includes: 1 Set 7.83HZ Schumann Wave -Low Frequency Generator Audio Resonator 1 Piece type-c Note: Notice: the Switch only for the indicator light ON/OFF The Transparent acrylic box need assembly it by yourself (The acrylic have the protective film) For more information please Google "Schumann Resonance".