Description: Schumann GeneratorProfessional measurement, 7.83Hz standard sine wave waveform is real and effectiveQuality Material Schumann Wave Generator is made of quality acrylic material and electronic components. It has adjustable frequence, is more stable, and has stronger anti interference.Power Supply and Output: Schumann Resonance Generator works on a DC voltage of 5V (DC4-15V) with a working current of 9-14MA. The power interface is Type C (supports TYPE C TO TYPE C power supply). It also features a signal voltage amplitude of 3V and includes a 3.5MM audio outputSpecificationDefault frequence: 7.83Hz. Adjustment range: 0.001HZ-100KHZPackage List1x Audio Resonator, 1x USB data cable Specification: Material: Acrylic Electronic components Size Chart: 10 cmx14 cm/3.94 inchx5.51 inch Package Includes: 1x Schumann Wave Generator1x USB data cable Note: Please allow slightly errors 1-2cm differences due to manual measurement.