Note: A USB data cable is included with every shipment! Product Features: 1. Made with high-quality materials, ensuring excellent frequency stability; 2. This product not only outputs a 7.83Hz Schumann wave but also incorporates programmable frequency modulation technology, allowing frequency adjustment within the range of 0.1Hz to 30kHz; 3. Two specifications are available to suit different needs: the green version only outputs a sine wave, while the black version supports sine waves, square waves, and inverted square waves; 4. Utilizes a digital circuit oscillator frequency reference, ensuring greater stability and stronger anti-interference capabilities; 5. Power supply interface uses a DC 5.5*2.1 or Micro USB interface for convenient use. Simply plug the USB end into a power bank, USB charger, or other USB-powered device to operate. Product Description: The Schumann wave itself does not directly improve sound or video quality by affecting the audio or video product. Instead, it affects the spatial environment, promoting relaxation, enhancing the body's perception of sound and images, improving work efficiency, and effectively relieving psychological stress. This product not only outputs a 7.83Hz Schumann wave, but also allows frequency adjustment within the range of 0.1Hz to 30kHz. It uses a digital circuit oscillator frequency reference, resulting in greater stability and stronger anti-interference capabilities. Product Parameters: Black Standard Version: Antenna Waveform: Sine Wave Interface Waveform: Sine Wave + Square Wave + Inverted Square Wave (Output interface is located in the lower left corner; waveforms are output simultaneously) Power Supply Interface: DC5.5*2.1 Power Supply Voltage: 5V Rated Power Consumption: <1W Default Frequency: 7.83Hz Adjustment Range: 0.1Hz~30000Hz Sine Wave Signal Voltage Amplitude: 3V Square Wave Signal Voltage Amplitude: 5V Circuit Board Size: Approx. 15*14CM Including Housing Size: Approx. 15.5*14.5*2.8CM Green Minimalist Version: Antenna Waveform: Sine Wave Interface Waveform: Sine Wave Power Supply Interface: Micro USB Power Supply Voltage: 5V Rated Power Consumption: <1W Default Frequency: 7.83Hz Adjustment Range: 0.1Hz~30000Hz Sine Wave Signal Voltage Amplitude: 3V Square Wave Signal Voltage Amplitude: 5V Circuit Board Size: Approx. 15*10CM Including Casing Size: Approx. 15.5*10.5*2.8CM Frequency Change Method: Directly input the frequency and press the lower left corner key to complete the setting. For example, press [7][.][8][3], then press [OK] to set the default power-on output to 7.83Hz. The setting range is 0.1~30KHz. Usage Method: Take out the USB cable included with the product, connect it to the circuit board, and plug the USB end into a power bank, USB charger, or other USB power supply device to operate. Frequency accuracy is only 99%, with an error of less than 1%. To produce sound, the audio jack must be plugged into an amplifier, or headphones can be used. The audio jack must be full inserted. Product List: 1* Schumann Wave Generator (with/without casing optional) 1* USB Cable