No longer fixed to 7.83 frequency, the range is from 0.01-99999Hz, and the step value is accurate to 0.01Hz, surpassing the past limitations and bringing more adjustable frequency options Combination of multiple waveforms; no longer confused about whether it is a square wave or a sine wave or whether it is only a Schumann wave Convenient and fast display, the device is equipped with an intelligent color touch screen, which displays the corresponding band according to the frequency, and can directly reach α β γ with one click. Simple operation and flexible use. Just press the screen button to reach it with one click. Even novices can easily master it Product name:Schumann wave generator (adjustable frequency) Power supply:AC110V-240V/or 5V Android input power supply Output interface:3.55mm AUX headphone interface Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage:AC110V-240V Colour:As Shown Material:acrylic Package Contents: 1 * Schumann Wave Generator Kit