Motorola RDU2020 Two Way Radio RDU2020 Two Way Radio features 89 built-in frequencies, with 83 digital and 38 analog private line codes, three call tones, and designed to Mil-Spec 810 IP54 specifications. In steel/concrete buildings, range is up to 250,000 square feet or up to 20 floors, or up to 5 miles outdoors in flat unobstructed areas.