How RT81 communicate with RT81P?

How RT81 communicate with RT81P? Many users of Retevis radios are familiar with RT81. As a durable and economical choice in digital radios, RT81 is always people’s first choice. RT81 has IP67 waterproof, no screen, but sturdy and durable; high power, it can reach a longer call distance. There are digital mode and analog mode […]

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