You will receive: a Schumann resonance generator, an acrylic case with a small magnet, and a USB data cable. Note: The acrylic case may have a slight odor, which will dissipate when placed in sunlight or a well-ventilated area for 2–3 days. It is recommended to remove any protective film before use. This device produces low-frequency electromagnetic waves; headphones are required to hear the output. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The sine wave generator allows user-defined frequency settings. Default frequency is 7.83 Hz. Other preset frequencies include 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveforms: sine wave, square wave, and reverse square wave. Suitable for various applications in laboratories, studios, and similar environments. Portable design: The generator measures approximately 5.9 x 5.5 x 1.2 inches. The acrylic case measures approximately 6.2 x 5.8 x 1.5 inches. Compact size and USB-powered for convenient use at home or while traveling. Stable and reliable: Default frequency is 7.83 Hz. Sine wave output voltage amplitude is 3 V; square wave output voltage amplitude is 5 V. Wide application: Suitable for environments requiring signal generation.