The original definition was hybrid digital. Some have said that it is now a brand name for the inventing company ( iBiquity Digital Corp.). The common use seems to be simply HD radio and defines the sepura earpiece that captures the HD signals. The use seems to be more of a brand than anything else.
Initially, after I installed the game, I was presented with a nice menu screen along with an aurally pleasing orchestral piece playing in the background. That's about it when it comes to the presentation because they aren't any cutscenes, or voiced mission briefs. All you'll get is tetra communications between HQ and the troops, which sets the mood for each mission, but if you're looking for cinematics that continue the story, of which there really isn't much of a story, you're better off looking elsewhere.
In situations where body temperatures increase to over 106oF it is likely that the persona has heat stroke. Call airwave communications straight away, then move the person into the shade. Cool the body down with water and fan.
These tips sepura communication may help you feel less overwhelmed when trying to choose a plumber. There may be a lot in your city, but they do not all offer these features. Find out which ones do in order to narrow down your options, and then contact a few of your top choices to find out more specific facts, such as pricing and scheduling information.