1. High-frequency stable output: supports Schumann frequency output with an adjustment range of 0.01Hz-100000Hz to ensure signal stability 2. Portable and easy to use: designed to be portable, easy to operate, suitable for home, office or travel scenarios. 3. Multiple waveforms: supports sine wave, square wave, and inverted square wave interface waveforms 4. Highly integrated design: digital circuit technology replaces complex analog circuits to improve anti-interference ability and stability 5. Schumann wave simulation: simulates the earth's natural Schumann waves, which helps to relax the body and mind and improve health. Power supply voltage: 5V Power supply interface: DC5.5x2.1 Rated power consumption: Less than 1W Default frequency: 7.83Hz Adjustment range: 0.01Hz-100000Hz Antenna waveform: sine wave Interface waveform: sine wave + square wave + inverted square wave Sine signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V Colour:Green Material:PCB Package Contents: 1 x Schumann Generator 1 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.