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 under sunlight 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 audio output. Adjustable frequency: Offers a frequency range from 0.01 Hz to 100,000 Hz, allowing you to customize settings for efficiency and personal preference. Default frequency is set at 7.83 Hz, with additional options including 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveforms: Provides sine wave, square wave, and reverse square wave outputs, suitable for various applications in environments such as laboratories and studios. Promotes relaxation: The adjustable resonance generator emits sine waves that help create a calming environment, supporting mental well-being and relaxation. Makes a thoughtful gift for holidays such as birthdays and Christmas. Portable design: 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 allow for easy portability and convenient use during travel or daily application. Stable performance: Features a stable sine wave output with a default frequency of 7.83 Hz, sine wave voltage amplitude of 3V, and square wave voltage amplitude of 5V, ensuring accurate and reliable signal output. Wide application: Suitable for use in electronic testing, equipment calibration, scientific experiments, and other scenarios requiring precise signal and frequency generation. Specifications: Frequency range: 0.01 to 100,000 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: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement allows for a 1-3 cm deviation.