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 outputs low-frequency signals and requires headphones for audio 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. Portable design: The generator measures approximately 5.9 x 5.5 x 1.2 inches; the acrylic case measures approximately 6.2 x 5.8 x 1.5 inches. Compact size and USB-powered operation enable convenient portability and use. Stable performance: Delivers consistent output signals. Sine wave amplitude: 3 V; square wave amplitude: 5 V. Wide application: Suitable for signal generation and frequency adjustment tasks such as electronic equipment testing, 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 - Materials: Metal + acrylic Package contents: - 1 x Adjustable sine wave resonance generator - 1 x Acrylic case - 1 x USB data cable Note: Colors may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.