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 generates low-frequency electromagnetic waves and requires the use of headphones. 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 options to adjust to 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 produces sine waves that help create a calming environment, supporting improved mental state and overall well-being. 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. Compact size and USB-powered operation allow for easy portability and convenient use at home, work, or during travel. Reliable performance: Features a stable sine wave output with a voltage amplitude of 3V and square wave output with a voltage amplitude of 5V, ensuring consistent and accurate signal delivery. Default frequency is 7.83 Hz. 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 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: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3 cm.