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 can 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. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The sine wave generator allows user-defined frequency settings for flexibility and personalization. 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 inverted square wave — suitable for various applications in laboratories, studios, and educational settings. Promotes relaxation: Emits sine waves designed to support a calm environment and enhance mental well-being. A thoughtful gift for birthdays, holidays, and special occasions. Portable size: 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, USB-powered design for easy transport and use. Stable and reliable output: Default frequency is 7.83 Hz. Sine wave voltage amplitude: 3 V. Square wave voltage amplitude: 5 V. Ensures signal stability and accuracy. Wide application: Suitable for signal generation and frequency adjustment tasks, including electronic testing, equipment calibration, and scientific experiments. Frequency range: 0.01 Hz to 300,000 Hz Default frequency: 7.83 Hz Power supply voltage: 5 V Sine wave voltage amplitude: 3 V Square wave voltage amplitude: 5 V Color: As shown Material: Metal + Acrylic Package contents: 1 x Adjustable sine wave resonance generator, 1 x Acrylic case, 1 x USB data cable Note: Color appearance may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.