The RDX series audio is 30% louder than previous XTX and AX series radios. Manufactured with a die cast metal chassis for increased durability; designed to meet tough Mil Spec 810 C,D,E,F and IP54/55 standard for shock, rain, humidity, salt, fog sand/dust, high and low temperature. RDX Series is compatible with the CLS, XTN and AX series and other radios operating on the same frequency and code. This durable two-way radio is ideally suited for construction, electrical, manufacturing/ warehousing, property management, and many other industries.