You will receive: This product is equipped with a resonance generator, an acrylic case with a small magnet, and a USB data cable. Note: The acrylic case may smell of glue, so it should be removed in the sun or in a ventilated place for 2 to 3 days. It is recommended to remove the film before use; this is a low-frequency electromagnetic wave, and you need to listen to it with headphones. Adjustable frequency: 0.01 to 100,000 Hz adjustable frequency range, our sine wave generator allows you to set it according to your needs for efficiency and customization; The standard frequency is 7.83 Hz, which can also be adjusted to 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, 963 Hz, etc. Multiple waveforms: Our audio generator offers multiple waveforms, namely sine wave, square wave, and inverted square wave, suitable for a variety of applications and a variety of environments such as laboratories and studios. Promotes happiness and relaxation: The adjustable resonance generator emits sine waves, creating a relaxing environment that improves your mental state and enhances your sense of happiness; It is also a warm gift for friends and family on birthdays, Christmas, and other holidays. Portable size: The audio generator measures approximately 13.5 x 13.5 x 3.8 cm and the acrylic box measures approximately 16.5 x 13.5 x 3.8 cm, which covers the frequency generator well, and is compact in size and USB-powered design for easy to carry and use or travel. Stable and reliable: sine wave generator, the standard frequency is 7.83 Hz, the sine wave voltage amplitude is 3V and the square wave voltage amplitude is 5V to increase the stability and accuracy of the output signal. Wide application: This adjustable frequency generator is very suitable for various environments that require signal generation and frequency adjustment, such as testing electronic equipment, calibrating equipment, and scientific experiments. Frequency range: 0.01 to 300,000 Hz Standard frequency: 7.83 Hz Power supply voltage: 5V Sine wave signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V Color: As shown Material: Metal+acrylic Package contents: 1 x Adjustable sine wave resonance generator 1 x Acrylic case 1 x USB data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.