Features: Elevates your communication experience with the Schumann Waves Generator DC5V 0.5A, enhances signal clear and reception for uninterrupted conversation. Crafted from ABS, this small size and lightweight generator can withstands everyday use while ensuring good performances. Suitable for both men and women, whether home or in the offices, the Schumann Waves Generator caters to all users. Let people relax physically and mentally, improve the human body perception of sounds and images, improving human health, enhances the work efficiency, and have a good effect on mental stress. 7.83HZ Waves-This product is a Schumann Waves 7.83HZ extremely low frequency generator with high accuracy and stability. Specifications: Material:ABS Size:Approx.160mm/6.29''x40mm/1.57'' Package Includes: 1Piece Schumann Resonance Generator note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.