The manufacturer's website states "Tissue electrodes for all promed Tens and EMT/EMS - devices". Unfortunately, it does not state whether the product is also compatible with brands other than "Promed". However, on other sites I could find information suggesting that these electrodes have universal connectors and should fit Prorelax. However, as this is not official information from the manufacturer, I unfortunately cannot guarantee this. I hope that I have been able to help.