Features: Shumanbo itself not directly act video products to improve the quality of sound and images, but on the space environment, the human body's perception of sound and images, and the improvement of the feedback to nature and life. It is used for visual space, bedroom, office, creative space, ceremony, meditations space, and more. With USB cable. Builtin 1000mAh battery, which can be charging once for 1 month.. for versatility, the Pulses Generator enhances visual spaces by improving sound fields and visual effects, offer relief from insomnia in bedrooms, and reduces stress and anxiety in offices, helping to relax and improve work efficiency. Specifications: Material:ABS Frequency: 7.83HZ Power: 0.5W Output waveform: square Waves Package Includes: 1Set 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.