Description: 【Schumann Generator】Professional measurement, 7.83Hz standard sine wave waveform is real and effective 【Quality Material】 Schumann Wave Generator is made of quality pcb material and electronic components. It has adjustable frequency, is more stable, and has stronger anti interference. 【Easy to Use】Schumann Resonance Generator is easy to use. Just take out the USB cable, connect the round hole end to the circuit board, and plug the USB end into a USB charging head or other USB powered device to work. 【Specification】Default frequency: 7.83Hz. Adjustment range: 0.001HZ-200KHZ. 【Package List】1x Audio Resonator, 1x USB data cable. Specification: Material: pcb, electronic components 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 at the same time) Supply voltage: 5V Sinusoidal signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V Size Chart: 15cmx14cm/5.91inchx5.51inch Package Includes: 1x Schumann Wave Generator 1x USB data cable Note: Please allow slightly errors due to manual measurement and different monitors.