Digital mobile radio (DMR) is a limited open digital versatile radio standard. It is characterized in the European Telecommunications Standards Institute Standard TS 102 361 parts 1–4. The essential objective of the standard is to indicate a computerized framework with low intricacy, minimal expense and interoperability across brands. It is utilized in commercial products all throughout the planet. DMR was intended with three tiers. DMR tiers I and II were first published in 2005, and DMR III (Trunked version) was established in 2012.