Features: Experience precise frequency control with the Schumann Generator, offering a adjustable ranges from 0.1Hz to 30000Hz, perfect for enhancing professional applications. Crafted from high quality ABS material, ensuring versatilities in use. For enthusiasts, researcher, and hobbyists seek reliable and stable frequency outputs for various experimental or practical purposes. Perfect for both home and travel, its size and USB power supply easy to transport and set up wherever need. The clear acrylic cover not only protects the device but also adds a aesthetic touch, making it a functional addition to your electronic toolkit. Specifications: Material: Plastic Frequency: 7.83hz Adjustable Ranges: 0.1Hz-30000Hz Size: About. 10x15cm/3.94x5.91in Package Includes: 1 Set Schumann Generator note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.