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 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. 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 personalization; the default frequency is 7.83Hz, which can also be adjusted to 174Hz, 285Hz, 396Hz, 417Hz, 528Hz, 639Hz, 741Hz., 852Hz., 963Hz, etc. Multiple Waveforms: Our audio generator offer 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. 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 warm gift for friends and family on birthdays, Christmas and other holidays 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 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. Wide application:This adjustable frequency generator is very suitable for various environments that require signal generation and frequency adjustment, such as electronic equipment testing, equipment calibration, and scientific experiments. Frequency range: 0.01 to 300000 Hz Default f