The M6 uses MURS band waves that are free (license Free) FreeWave

RV-M35 Daisy Radio Integrate this low-cost miniature modem into your device for secure long range connectivity to you private network or IoT if you want. Raveon's RV-M35 Daisy Radios are our lowest cost small wireless solution for daisy chaining all…

RV-M6 Daisy Radio Raveon's RV-M6 Daisy Radios are our smallest ultra-low-cost wireless solution for daisy chaining all your large scale operations using narrow-band VHF or UHF radio channels. This radio is perfect for tracking any number of items over as…