Features 1.Promote Relaxation and Well Being: The schumann wave generator emits a sinusoidal wave that helps create a relaxing environment and promotes overall well being. 2.Adjustable Frequency Range: With an adjustable range of 0.01?100000Hz, you can customize the frequency according to your needs, allowing for enhanced effectiveness and personalization. 3.Multiple Waveforms: This generator provides multiple waveforms including sinusoidal, square wave, and inverted square wave, allowing for versatile applications and a wider range of uses. 4.Compact and Convenient: The PCB board size of the generator is 15x15cm, making it compact and easy to carry. It can be powered by a USB interface, providing convenience for both home and travel use. 5.Stable and Reliable: The Schumann Wave Generator ensures stable frequency output, with a default frequency of 7.83Hz. The waveform signals have voltage amplitudes of 3V for sinusoidal wave and 5V for square wave. specificationItem Type: Schumann Wave Generator Material: PCB Board Size: Approx. 15x15cm / 5.9x5.9in Antenna Waveform: Sine Wave Interface Waveform: Sine Wave, Square Wave, Inverted Square Wave (the Lower Left Corner Is The Output Interface, Waveform Output At The Same Time) Power Supply Interface: DC5.5x2.1 Supply Voltage: 5V Rated Power Consumption: