1.This product is made of 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 frequencymodulation technology, can adjust the frequency in the range of 0.01Hz~100000Hz; 3. Digital circuit crystal frequency benchmark, more stable, stronger anti-interference; 4. The power supply interface adopts the Type-c interface, which is easy to use and supports Type-c to Type-c power supplies. Product Description: Schuman wave itself is not directly acting on sound or video products to improve the sound qualitybut the role of the space environment, so that people's body and mind can be relaxed, improve thebody's perception of sound and images, improve the health of the human body work efficiency, relievepsychological pressure also has a good effect. The product can not only output 7.83Hz Schumannwave, but also adjust the frequency in the range of 0.01Hz-100KHz, digital circuit crystal oscillatorfrequency reference, more stable, stronger anti-interference, using low-temperature drift crystaloscillator and high-precision DAC dedicated chip, can precisely output frequency and pure sine wave. Parameter: Working voltage: DC 5V Working current: 1A Power interface: Type-C (supports Type-C to Type-C power supply) Default frequency: 7.83Hz Adjustment range: 0.01Hz~100000Hz pure sine wave Signal voltage amplitude: 3V Featuring a 3.5MM audio output interface With acrylic shell Color: As Shown Material: plastic Package Contents: 1* Schumann Wave Generator 1*AUX cable 1*speaker 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.