Feature: 1. This product is made of high quality materials, the use of low temperature drift crystal oscillator and high precision DAC special chip, the product has good frequency stability;2. This product can not only output 7.83Hz Schuman wave, but also add programmable frequency modulation technology, can adjust the frequency in the range of 0.01Hz~100000Hz;3.2 kinds of , there are 2 kinds without and with can be according to demand;4. Digital circuit crystal frequency benchmark, more stable, stronger antiinterference;5. The power supply interface adopts the Typec interface, which is easy to use and supports Typec to Typec power supplies.:Schuman wave itself is not directly acting on sound or video products to improve the sound quality, but the role of the space environment, so that people's body and mind can be relaxed, improve the body's perception of sound and images, improve the health of the human body work efficiency, relieve psychological pressure also has a good effect. The product can not only output 7.83Hz Schumann wave, but also adjust the frequency in the range of 0.01Hz100KHz, digital circuit crystal oscillator frequency reference, more stable, stronger antiinterference, using lowtemperature drift crystal oscillator and highprecision DAC dedicated chip, can precisely output frequency and pure sine wave.Product parameters:Working voltage: DC 5V (DC 415V)Power interface: Typec (Support Typec to Typec power supply)Default frequency: 7.83HzAdjustment range: 0.01Hz~100000Hz pure sine waveSignal voltage amplitude: 3VTips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect UseSet: B withoutMaterial: PCBcolour: As shownPackage Contents:1 x Schumann Wave GeneratorOnly 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 +/ 13cm.