Features: The schumann signal device provides accurate frequency adjustment and precise waveform output. Its user friendly design and stable operation make it a great choice for professionals in the field of electronics and testing. Designed for various environments such as laboratories, schools, and studios, where signal generation and frequency adjustment are required. Perfect for electronic device testing, equipment calibration, and scientific experiments. Unlock new possibilities with the schumann signal device and improve your work or projects. Specifications: Material:PCB Size/Style:As Picture Shown Color:Green/RedColor Green standard version: Circuit board size: 15x15cm Antenna waveform: sine waves Interfaces waveform: sine waves+square waves+inverse square waves (the bottom left corner is the output interfaces, and the waveform is output simultaneously) Power supply interfaces: DC5.5x2.1 Power supply voltage: 5V RatedPower Consumption:<1W Default frequency: 7.83Hz Adjustment range: 0.1Hz~30000Hz Sinusoidal signal voltage amplitude: 3V Square waves signal voltage amplitude: 5V Package Includes: 1 Set Schumann Waves Resonance Generator note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.