Parts List: 1 x Generator (With Cover) 1 x USB Cable Highlight description: Premium Material: This schumann resonance sine wave generator adopts premium material to improve enduring. It adopts low temperature drift crystal oscillator and high precision DAC dedicated chips to accurately output frequency and pure sine waves Stable: This sine wave resonance generator ensures stable frequency output with a default of 7.83 hz. In addition to 7.83 Hz, the following frequencies are also beneficial to your body: 0.83, 6.5, 14.3, 20.8, 27.3 and 33.8 Hz (33.81 Hz) Compact and Portable: This is an economic version of the Schumann wave adjustable signal generator. It is small in size and easy to carry How to Use: Take out the included USB cable, plug the round hole end into the circuit board, and the USB end into a power bank or USB charging head or other USB powered device Easy to Use: Press the button and to enter the value you need and then press the OK button to confirm. Sine signal voltage amplitude of 3V Detailed description: Description: This Schumann Resonance Sine Wave Generator is a 7.83 Hz ultra low frequency Schumann wave generator with high precision and stability. Equipped with a USB cable, it is easy to use. Its compact size makes it easy to carry. Feature: Adjustable: You can customise the frequency from 0.1Hz to 30,000Hz to improve efficiency and personalisation. Stable: This sine wave resonator uses high precision DAC dedicated chip to ensure stable frequency output, the default value is 7.83Hz. Specification: Product Name: Schumann Resonance Sine Wave Generator Product Material: Board: PCB Cover: Acrylic PCB size: 15×10×1.5 cm Antenna waveform: sine wave (The circular shape has only sine output and no square wave) Power supply interface: DC5.5×2.1 Power supply voltage: 5 V Rated power: less than 1 W Default frequency: 7.83 Hz Adjustment range: 0.1 Hz-30000 Hz Sine signal voltage amplitude: 3 V Notes: 1.There may be slight differences between the picture and the actual color of the commodity. We will try our best to show you the exact color. 2.Please allow slight dimension difference due to manual measurement. Premium Material: This schumann resonance sine wave generator adopts premium material to improve enduring. It adopts low temperature drift crystal oscillator and high precision DAC dedicated chips to accurately output frequency and pure sine waves Stable: This sine wave resonance generator ensures stable frequency output with a default of 7.83 hz. In addition to 7.83 Hz, the following frequencies are also beneficial to your body: 0.83, 6.5, 14.3, 20.8, 27.3 and 33.8 Hz (33.81 Hz) Compact and Portable: This is an economic version of the Schumann wave adjustable signal generator. It is small in size and easy to carry How to Use: Take out the included USB cable, plug the round hole end into the circuit board, and the USB end into a power bank or USB charging head or other USB powered device Easy to Use: Press the button and to enter the value you need and then press the OK button to confirm. Sine signal voltage amplitude of 3V