1STABLE FREQUENCY: Schumann wave pulse generator adopt DSP signal synthesis technology, with stable signal and high frequency stability, you can use with confidence 2MULTIPLE 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 3BENEFIT 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 4TECHNICAL 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 5RELIABLE TO USE: Ultra low frequency pulse generator ensure accurate working with a good durability and wear resistance, you can use for a long time 1 x SchumannResonanceGenerator 1 x Power Cord Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.