Both ActiPatch and RecoveryRx Specifications are in the 510k Summary Documents RecoveryRx https://www.accessdata.fda.gov/cdrh_docs/pdf19/K190251.pdf ActiPatch https://www.accessdata.fda.gov/cdrh_docs/pdf19/K192234.pdf The only difference that I have noted is that you can find a RecoveryRx with the smaller antenna size. I have never seen this offered in an ActiPatch. 12cm is the standard antenna size. When you drop to 8 or 6cm you have the same power being applied to a smaller area. I have used an 8cm antenna for neck pain and found a noticeable difference when compared to the 12cm.