Professional generator Schumann Easy to use Green Low Frequency DC 5V 7,83Hz Description: [Generator]Professional measurement, standard 7,83Hz sine waveform is real and effective [ Material] Wave made of acrylic material and electronic components. It has adjustable frequency, is more stable and ma better interference resistance. [Power supply and output]: Generator operates at a constant voltage of 5 V (DC4-15 V) and an operating current of 9-14 MA. The power interface is Type C (supports TYPE C TO TYPE power supply). It also has a 3V voltage amplitude and includes a 3,5mm audio output [Specification] Default frequency: 7,83 Hz. Adjustment Range: 0,001HZ-100KHZ [Package List] 1x Audio Resonator, 1x data cable USB Specification: Material: Acrylic Electronic Components Size Chart: 10 cm x 14 cm/3,94 inch x 5,51 inch The package includes: 1x Wave Generator 1x USB cable for data transmission