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 naturally 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 Hz to 100,000 Hz. The device allows user-defined frequency settings for flexibility and customization. Default output 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 waveform outputs: sine wave, square wave, and inverted square wave — suitable for general-purpose signal generation in educational, laboratory, or studio environments. Compact design: The generator measures approximately 5.9 x 5.5 x 1.2 inches; the acrylic enclosure measures approximately 6.2 x 5.8 x 1.5 inches. USB-powered for portability and convenient use at home or on the go. Output specifications: Sine wave amplitude is 3 V; square wave amplitude is 5 V. Designed for stable and consistent signal output. Applications: Suitable for general-purpose signal generation in educational, hobbyist, and technical settings.