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 will dissipate naturally when placed in sunlight or a well-ventilated area for 2–3 days. It is recommended to remove any protective film before use. Headphones are required to hear the output, as this device produces low-frequency audio signals. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The sine wave generator allows precise frequency selection for customized use. 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: Supports sine wave, square wave, and inverted square wave outputs—suitable for laboratory, studio, and educational applications. Designed for relaxation: Generates pure sine wave tones intended to support a calm environment and promote mental well-being. A thoughtful gift for birthdays, holidays, and special occasions. Portable design: The generator measures approximately 5.9 x 5.5 x 1.2 inches; the acrylic enclosure measures approximately 6.2 x 5.8 x 1.5 inches. Compact, lightweight, and powered via USB for convenient use at home, in the lab, or on the go. Stable performance: Delivers consistent signal output with default frequency of 7.83 Hz. Sine wave voltage amplitude: 3 V. Square wave voltage amplitude: 5 V. Wide application: Suitable for electronic testing, equipment calibration, scientific experiments, and educational demonstrations. Specifications: Frequency range: 0.01 Hz to 300,000 Hz Default frequency: 7.83 Hz Power supply: 5 V DC via USB Sine wave output amplitude: 3 V Square wave output amplitude: 5 V Color: As shown Material: Metal + acrylic Package includes: 1 x Adjustable sine wave resonance generator 1 x Acrylic case 1 x USB data cable Note: Color appearance may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.