Wide application: The Schumann wave generator provides sine wave, square wave and reverse square wave options. The included acrylic dust cover helps protect the circuit board. Adjustable frequency: You can customize the frequency from 0.01 Hz to 99999 Hz to improve efficiency and customize. Stable: The Schumann wave generator guarantees a stable frequency output, with a standard value of 7.83 Hz, a sine wave voltage amplitude of 3V, and a square wave voltage amplitude of 5V. Compact structure and easy to carry: The Schumann wave generator is small in size and powered by USB, which is easy to carry at home or when traveling. Promote relaxation: The Schumann wave generator can emit sine waves to create a relaxing and pleasant environment and promote physical and mental pleasure. This product is an ultra-low frequency Schumann wave generator with a frequency output of 7.83 Hz and a stable frequency. It comes with a USB cable, which is easy to use and compact, making it easy to travel or carry with you, helping to relax the body and mind and enhance happiness. Adjustable frequency range: You can customize the frequency from 0.01 Hz to 99999 Hz, which is convenient to use. Stable: This sine wave resonator guarantees a stable frequency output with a standard value of 7.83 Hz. Product Name: Schumann Wave Generator Adjustment Range 0.01 Hz - 99999 Hz Sine Wave Signal Voltage Range: 3V Square Wave Signal Voltage Range: 5V Power Interface DC 5.5x2.1mm Nominal Power Consumption Less than 1W Antenna Waveform: Sine Wave Interface Waveform: Sine Wave + Square Wave + Inverted Square Wave (The lower left corner is the output interface, and the waveforms are output simultaneously) Color:Red Material:PCB+Acrylic Package Contents: 1 * Schumann Wave Generator 1 * USB cable(The