Features: Experience unparalleled frequency stability with our Schumann Waves Generator, featuring sine waves adjustable from 0.01Hz to 100,000Hz, for precise applications. Crafted with quality materials, this generator utilizes a low temperature drift crystal oscillator and high precise chip, ensuring robusts performances and enhances interferences resistance. Perfect for both enthusiasts and professionals seekings reliable frequency modulation in their projects or experiments. Suitable for use in home studios, research lab, or any environment where stable frequency generation is important, thanks to its Type C power interfaces. The product is plugs and play. When the frequency is high, there will be a deviation of less than 1%between the input and the actual output. The sound output of the speaker is base on the frequency. At low frequencies, the human ear cannot hear it. If the speaker is plugged in and the frequency reaches the hearing ranges, there will be sound. Specifications: Component:ABS Size:Approx.14.6x8.6cm/7.54x3.39inch Working Voltages: Dc5v (Dc4-15v) Working Current:8-14ma Power Interfaces: Type C (Supports Type C to Type C Power Supply) Defaults Frequency:783hz Adjustment Ranges: 0.01hz~100000hz Sine Waves Package Includes: 1pc Schumann Waves Generator(without Shell) note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.