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 be dissipated by placing it in a well-ventilated area or in the sun for 2 to 3 days. It is recommended to remove the protective film before use. This device generates low-frequency electromagnetic waves and requires the use of headphones for o output. Adjustable frequency range: 0.01 Hz to 100,000 Hz, allowing customization for various needs. Default frequency is set at 7.83 Hz, but can be adjusted to other frequencies such as 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveforms available: sine wave, square wave, and reverse square wave, suitable for a variety of applications in environments such as laboratories and studios. Promotes relaxation: The resonance generator produces sine waves that help create a calming environment, supporting mental well-being. Makes a thoughtful gift for friends and family on occasions such as birthdays and holidays. Compact and portable: The sound generator measures approximately 5.9 x 5.5 x 1.2 inches, and the acrylic case measures approximately 6.2 x 5.8 x 1.5 inches, providing secure coverage. Its compact size and USB-powered design make it convenient for travel and on-the-go use. Stable and reliable performance: The sine wave generator has a default frequency of 7.83 Hz, with a sine wave voltage amplitude of 3V and square wave voltage amplitude of 5V, ensuring consistent and accurate signal output. Wide range of applications: Suitable for tasks requiring signal generation and frequency adjustment, including electronic equipment testing, calibration, and scientific experiments. 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 the color of the product as shown. Measurement error allowance is +/- 1-3 cm.