Feature: 1. STABLE FREQUENCY: Schumann wave pulse generator adopt DSP signal synthesis technology, with stable signal and high frequency stability, you can use with confidence 2. MULTIPLE USES: Schumann resonance generator can be connected to an external oscilloscope to observe waveforms. Can also be connected to the external speaker, hand touch feeling waveform vibration 3. BENEFIT TO HEALTH: The schumann wave generator benefit people physical and mental relaxation, improve body perception of sound and images, and improve health of human body 4. TECHNICAL PARAMETERS: The schumann wave generator is powered by a USB interface with a voltage of 5V, rated power of less than 1W and frequency of 7.83Hz 5. RELIABLE TO USE: Ultra low frequency pulse generator ensure accurate working with a good durability and wear resistance, you can use for a long time Specification: Item Type: Schumann Resonance Generator Antenna Waveform: Sine wave Interface Waveform: Sine wave, square wave, inverted square wave(output interface in the lower left corner, waveforms output simultaneously) Power Supply Voltage: 5V Rated Power: <1W Default Frequency: 7.83Hz Adjustable Frequency Range: 0.1Hz-30000Hz Sine Signal Voltage Amplitude: 3V Square Signal Voltage Amplitude: 5V. Package List: 1 x Schumann Resonance Generator1 x Power Cord