You receive: This product includes a 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 naturally when placed in a well-ventilated area or under indirect sunlight for 2–3 days. It is recommended to remove any protective film before use. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The device allows users to select frequencies based on their needs. 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. Waveform options: Sine wave, square wave, and inverted square wave. Suitable for laboratory, studio, and educational applications. 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 and transport. Electrical specifications: - Power supply: 5 V DC via USB - Sine wave output amplitude: 3 V - Square wave output amplitude: 5 V - Frequency accuracy and stability supported by built-in circuitry Applications: Signal generation, electronic testing, equipment calibration, and scientific experiments. Package contents: - 1 x Adjustable sine wave resonance generator - 1 x Acrylic case - 1 x USB data cable Note: Color may vary slightly due to lighting and screen settings. Dimensions are subject to a tolerance of ±1–3 cm due to manual measurement.