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 in a well-ventilated area or under indirect sunlight within 2–3 days. It is recommended to remove any protective film before use. This device generates low-frequency electromagnetic signals and requires headphones for audio output. Adjustable frequency range: 0.01 Hz to 100,000 Hz. The sine wave generator allows customizable 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. Compact and 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. USB-powered for convenient use and portability. Stable signal output: Sine wave voltage amplitude: 3 V; square wave voltage amplitude: 5 V. Default frequency: 7.83 Hz. Power supply: 5 V DC via USB. Wide application: Suitable for electronic testing, equipment calibration, educational demonstrations, and scientific experiments. Frequency range: 0.01 Hz to 300,000 Hz Power supply voltage: 5 V Sine wave output amplitude: 3 V Square wave output amplitude: 5 V 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: Color appearance may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.