Usually probes are universal size but this machine comes with probes anyway and to be on safe size we do not recommend to use other probes on our machines or vice versa.
Even though high frequency is a safe unit, since it has a electric current it can cause some complication. We recommend for you to consult with your doctor before using it.
We are offer a one year warranty that covers nonphysical damage. Being that we are the manufactures if you experience an issue after the warranty is over you can contact us for assistance and we will provide perhaps at a small price.