Features: 1. Adjustable frequency range from 0.01 to 100,000 Hz, allowing precise tuning for various applications; default frequency is 7.83 Hz, with presets for 174, 285, 396, 417, 528, 639, 741, 852, 963 Hz. 2. Multiple waveforms: sine wave, square wave, and reverse square wave, suitable for lab, studio, and signal testing. 3. Compact and portable: size approximately 5.9 x 5.5 x 1.2 inches, with an acrylic case (6.2 x 5.8 x 1.5 inches) for protection; USB-powered for easy travel. 4. Stable output: sine wave voltage amplitude 3V, square wave voltage amplitude 5V, ensuring reliable signal generation. 5. Wide application: ideal for electronic equipment testing, calibration, scientific experiments, and creating a relaxing environment through low-frequency electromagnetic waves (use headphones for audio). Product Details: Specifications: Frequency range 0.01-100000Hz; Default frequency 7.83Hz; Sine wave amplitude 3V; Square wave amplitude 5V; Power via USB cable; Acrylic case included with small magnet. Note: Acrylic case may have glue odor; air out for 2-3 days before use. Remove protective film before use.