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. 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 precision. Default frequency is 7.83 Hz; other preset options include 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, and 963 Hz. Multiple waveform outputs: sine wave, square wave, and inverted square wave — suitable for various applications including laboratory testing and audio experimentation. 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 easy transport and use. Stable performance: Sine wave output voltage amplitude is 3 V; square wave output voltage amplitude is 5 V. Default frequency is 7.83 Hz. Specifications: - Frequency range: 0.01 Hz to 300,000 Hz - Power supply: 5 V via USB - Sine wave amplitude: 3 V - Square wave amplitude: 5 V - Color: As shown - Materials: Metal + acrylic Package includes: - 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. Measurement tolerance: ±1–3 cm.