Ⅰ. You receive: This product is equipped with a resonance generator, an acrylic case with a small magnet, a USB data cable. Note: The acrylic case may have a glue smell, so it should be dissipated 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 hear the headphones. Ⅱ. 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; the default frequency is 7.83Hz, which can also be adjusted to 174Hz, 285Hz, 396Hz, 417Hz, 528Hz, 639Hz, 741Hz, 852Hz, 963Hz, etc. Ⅲ. Multiple Waveforms: Our audio generator offers multiple waveforms, namely sine wave, square wave and reverse square wave, suitable for a range of applications and a variety of environments such as laboratories and studios. Ⅳ. Promote 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 gift for friends and family on birthdays, Christmas and other holidays. Ⅴ. Portable Size: The sound generator measures approximately 5.9 x 5.5 x 1.2 inches and the acrylic box measures approximately 6.2 x 5.8 x 1.5 inches, which covers the frequency generator well, and is compact in size and USB-powered design for easy carrying and application or travel. Ⅵ. Stable and reliable: sine wave generator, the default frequency is 7.83Hz, the sine wave voltage amplitude is 3V, and the square wave voltage amplitude is 5V to the stability and accuracy of the output signal. Ⅶ. Wide application: This adjustable frequency generator is very suitable for environments that require signal generation and frequency adjustment, such as electronic equipment testing, equipment calibration, and scientific experiments. Ⅷ. Frequency range: 0.01 to 300000 Hz Ⅸ. Default frequency: 7.83Hz Ⅹ. Power supply voltage: 5V Ⅺ. Sine signal voltage amplitude: 3V Ⅻ. Square wave signal voltage amplitude: 5V ⅩⅢ. Colour: As Shown ⅩⅣ. Material: Metal+Acrylic ⅩⅤ. 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. ⅩⅥ. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.