Severs has already said everything I was going to say about the Microphone/earpieces.
Just out of interest what power are these? They say they're UK legal so that should be half of a watt. If so then don't expect the 5km range (not unless you're sat on a hill talking to someone on another hill 5kms away) More likely round town/forests/hilly terrain you'll get about half a mile with comms getting steadily worse with anything over a kilometer or more which will also be very dependant on where you mount them.
Kymmy

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