@ruralgal76 Cheri, I agree with the acronyms...especially the ones that are not obvious. LOL I RLT (Red Light Therapy-photobiomodulation) (620nm–700nm) is more for skin surface. However, NIR (near Infrared ) is best for inflammation, arthritis and pain (780nm–1200nm). LEDs - type of bulb used. LDN-(Low Dose Naltraxone) is an off-label therapy useful for pain, neuropathy, and so much more...recommend doing a search on its benefits. TECAR-(Transfer of Energy Capacitive and Resistive) is radiofrequency-based, electrotherapy modality that helps improve range of motion amongst other benefits. I hope this helps with a few of them. 🙂