Overview The Schumann wave does not directly enhance audio or video performance, but may influence the spatial environment to support mental and physical relaxation. It may help improve perception of sound and images, contribute to overall well-being, support healthy work efficiency, and assist in reducing psychological stress. This device generates a 7.83Hz Schumann frequency and offers adjustable output from 0.1Hz to 30kHz. It features a digital circuit with crystal oscillator frequency reference for improved stability and stronger interference resistance. Features 1. Constructed with high-quality materials for reliable frequency stability. 2. Capable of generating a 7.83Hz Schumann frequency, with programmable frequency tuning adjustable from 0.1Hz to 30kHz. 3. Two models available: the green version provides sine wave output only; the black model supports sine wave, square wave, and inverted square wave outputs, selectable based on user needs. 4. Equipped with digital circuitry and crystal frequency reference for enhanced stability and interference resistance. 5. Power supplied via DC5.5*2.1mm jack or Micro USB interface. Compatible with power banks, USB chargers, or other standard USB power sources. Specifications Black Standard Model: - Antenna Waveform: Sine wave - Output Waveforms: Sine wave, square wave, inverted square wave (simultaneous output via lower-left interface) - Power Input: DC5.5*2.1mm - Operating Voltage: 5V - Rated Power Consumption: <1W - Default Frequency: 7.83Hz - Adjustment Range: 0.1Hz – 30,000Hz - Sine Signal Amplitude: 3V - Square Wave Signal Amplitude: 5V - PCB Size: Approx. 15 x 14 cm - Enclosure Size: Approx. 15.5 x 14.5 x 2.8 cm Green Version: - Antenna Waveform: Sine wave - Output Waveform: Sine wave - Power Input: Micro USB - Operating Voltage: 5V - Rated Power Consumption: <1W - Default Frequency: 7.83Hz - Adjustment Range: 0.1Hz – 30,000Hz - Sine Signal Amplitude: 3V - Square Wave Signal Amplitude: 5V - PCB Size: Approx. 15 x 10 cm - Enclosure Size: Approx. 15.5 x 10.5 x 2.8 cm Frequency Adjustment Method Enter desired frequency using keypad. Press the lower-left key to confirm. Example: Press [7] [8] [3], then [OK] to set 7.83Hz. Default output is 7.83Hz. Adjustable range: 0.1Hz to 30kHz. Usage Instructions Connect the included USB cable to the board and plug the USB end into a power bank, USB charger, or other standard USB power source to operate. Package Includes 1 x Schumann Wave Generator (with or without enclosure, as selected) 1 x USB Cable