Adjustable Frequency: with an adjustable frequency range of 0.01 to100000Hz, our sine wave generator allows you to set according to your needs for increased efficiency and personalization; The default frequency is 7.83Hz, and it can also be adjusted to 174Hz, 285Hz, 396Hz, 417Hz, 528Hz, 639Hz, 741Hz, 852Hz, 963Hz, and more. Multiple Waveforms: our sound frequency generator resonator provides multiple waveforms, namely sinusoidal, square wave, and inverted square wave, which is suitable for wider applications and various environments, such as laboratories and studios. Promote Pleasure and Relaxation: the adjustable schumann resonance generator can emit sine waves to create a relaxing environment, improving the state of your mind and enhance your well being; It'll also be a warm gift for friends and families on birthday, Christmas and more. Colour:green Material:plastic The actual product may have slight color difference or difference, which will not affect the use Package Contents: 1 x Sine Wave Resonance Generator 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 measurement allowed error is +/- 1-3cm.