?Made of high quality ABS material, it is durable and has a long service life. With LED display, the data is clearly visible and the operation is more convenient ?The frequency amplitude is adjustable and the duty cycle is continuously adjustable ?The single-chip microprocessor is used to control the operation and display of the whole machine, which is highly intelligent and easy to operate and use ?Both FM knobs have maximum and minimum direction adjustments that can be adjusted to suit your needs ?100% Guarantee: High quality product, we promise to do everything possible to satisfy all customers. However, if you are not 100% satisfied with our service or our products, simply contact us. We are always at the side of our customers to support and continuously seek new ways to improve