Overview The Schumann wave generator is designed to influence the spatial environment, promoting physical and mental relaxation. It may help support overall well-being, enhance perception of sound and images, and contribute to reduced psychological stress. This device generates a 7.83Hz Schumann wave and offers adjustable frequency output from 0.1Hz to 30kHz. It features a digital circuit with crystal oscillator frequency reference for improved stability and strong anti-interference performance. Features 1. Constructed with high-quality materials for reliable frequency stability. 2. Capable of generating a 7.83Hz Schumann wave and includes programmable frequency tuning, allowing adjustment from 0.1Hz to 30kHz. 3. Available in two versions: the green model 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 a digital circuit and crystal frequency reference for enhanced signal stability and interference resistance. 5. Powered via DC 5.5*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 Supply Interface: DC 5.5*2.1mm - Supply Voltage: 5V - Rated Power Consumption: <1W - Default Frequency: 7.83Hz - Adjustment Range: 0.1Hz – 30,000Hz - Sine Signal Voltage Amplitude: 3V - Square Wave Signal Voltage Amplitude: 5V - Circuit Board Size: Approx. 15 x 14cm - With Enclosure Size: Approx. 15.5 x 14.5 x 2.8cm Green Version: - Antenna Waveform: Sine wave - Output Waveform: Sine wave only - Power Supply Interface: Micro USB - Supply Voltage: 5V - Rated Power Consumption: <1W - Default Frequency: 7.83Hz - Adjustment Range: 0.1Hz – 30,000Hz - Sine Signal Voltage Amplitude: 3V - Square Wave Signal Voltage Amplitude: 5V - Circuit Board Size: Approx. 15 x 10cm - With Enclosure Size: Approx. 15.5 x 10.5 x 2.8cm Frequency Adjustment Method Enter the desired frequency using the keypad. Press the lower-left key to confirm. Example: Press [7][8][3], then press [OK] to set frequency to 7.83Hz. The default output frequency is 7.83Hz, adjustable within 0.1Hz to 30kHz range. Usage Instructions Connect the included USB cable to the device and plug the USB end into a power bank, USB charger, or any standard USB power source to operate. Package Includes 1 x Schumann Wave Generator (with or without enclosure, as selected) 1 x USB Cable