You will receive: This product includes a frequency 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 to 3 days. It is recommended to remove any protective film before use. Headphones are required to hear the output. Adjustable frequency range: 0.01 to 100,000 Hz. The device allows user-defined frequency settings for flexibility and customization. Default frequency is 7.83 Hz; other preset options 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 inverted square wave outputs for versatile applications in laboratories, studios, and similar environments. Compact design: The frequency 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. USB-powered for portability and ease of use at home or while traveling. Stable output: Sine wave voltage amplitude is 3 V; square wave voltage amplitude is 5 V. Ensures consistent and accurate signal generation. Wide application: Suitable for environments requiring precise signal generation.