PMR stands for Personal Mobile Radio and PMR446 refers to the UHF frequency range 446MHz on which license-free two-way radios are permitted to operate in the European Union on a restricted frequencies from 446.000 to 446.200 MHz without the need for licence-fees or other requirements.
License-free radios are generally handheld radios used for business or personal use to keep in touch with friends or family.
PMR446 walkie-talkies are appreciated because they offer effective and general-purpose communications and are less expensive than conventional licenced radios and very easy to use after with no infrastructure required.