Description: Material: Schumann wave generator is made of pcb material and electronic components. It has adjustable frequency, is more stable, and has stronger anti interference Feature: Tailor the frequency from 0.01 Hz to 30,000 Hz to suit your specific needs and enhance efficiency. This flexibility allows for accurate adjustments in various settings Stable Output: Enjoy consistent frequency output with a standard value of 7.83 Hz. The device provides a sine wave voltage amplitude of 3V and a square wave voltage amplitude of 5V, ensuring reliable performance Portable: Measuring 15cmx15cm and powered USB, this Schumann wave generator is easy to carry whether at home or on the go, making it ideal for travel or personal use Versatile: This Schumann wave generator offers a variety of waveform options including sine, square, and inverted square waves Specification: Material: PCB Size Chart: 15cmx15cm/5.91inchx5.91inch Package Includes: 1 Piece Schumann Wave Generator 1 Piece USB Data Cable Note: Please allow slightly errors due to manual measurement and different monitors.