Description: USAGE: Schumann 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. HIGH QUALITY: Using high quality plastic material, durable. ADVANTAGE: This product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability. Using high stable frequency acquisition elements, high stability chip, precision correction capacitance, precision multi-loop adjustable resistor. OCCASION: Suitable for bedroom, office, tea room and so on. For the tea ceremony, spirituality, realization space resting body and mind. Specification: Material: Plastic Color: Blue Rated voltage: DC 5V Rated current: 0.5A 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.) Size Chart: 102x80mm / 4.02x3.15inch Package Includes: 1 Piece Schumann Wave Generator 1 Piece USB Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!