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 a well-ventilated area or under indirect sunlight for 2 to 3 days. It is recommended to remove any protective film before use. This device generates low-frequency electromagnetic signals; headphones are required to hear the output. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The sine wave generator allows user-defined frequency settings for flexibility and customization. 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 various applications including laboratory and studio environments. Designed for relaxation: Generates consistent sine wave signals 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, providing full coverage. Compact size and USB-powered operation enable convenient portability and use. Stable performance: Delivers accurate and consistent signal output. Default frequency is 7.83 Hz. Sine wave output amplitude is 3 V. Square wave output amplitude is 5 V. Wide application: Suitable for signal generation and frequency adjustment tasks, including electronic equipment testing, instrument calibration, and scientific experiments. 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 and acrylic Package contents: 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. Dimensional tolerance: ±1–3 cm.