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 when placed in sunlight or a well-ventilated area for 2 to 3 days. It is recommended to remove the protective film before use. This device produces low-frequency electromagnetic waves and requires the use of headphones for o output. Adjustable frequency range: 0.01 to 300,000 Hz, allowing customization for various needs. Default frequency is set at 7.83 Hz, with additional selectable frequencies including 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveforms: The o generator supports sine wave, square wave, and reverse square wave outputs, making it suitable for a variety of applications in environments such as laboratories and studios. Promotes relaxation: The adjustable resonance generator produces sine waves that help create a calming environment, supporting mental relaxation and well-being. Makes a thoughtful gift for friends and family on ocns such as birthdays and holidays. Portable design: The sound generator measures approximately 5.9 x 5.5 x 1.2 inches, with the acrylic case measuring approximately 6.2 x 5.8 x 1.5 inches, providing secure protection. Its compact size and USB-powered design allow for easy portability and use during travel. Stable and reliable performance: The sine wave generator delivers a consistent output with a default frequency of 7.83 Hz, sine wave voltage amplitude of 3V, and square wave voltage amplitude of 5V, ensuring signal stability and accuracy. Wide application: Suitable for use in electronic equipment testing, device calibration, and scientific experiments where signal and frequency control are required. Specifications: Frequency range: 0.01 to 300,000 Hz Default frequency: 7.83 Hz Power supply voltage: 5V Sine wave voltage amplitude: 3V Square wave voltage amplitude: 5V 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: The package includes only the items listed above. Light reflection and differences in display screens may cause slight variations in color between the image and the actual product. Measurement error allowance is +/- 1-3 cm.