Normal two way radio is Half-duplex , only one direction at a time (not simultaneously),Typically, once a party begins receiving a signal, it must wait for the transmitter to stop transmitting, before replying. But Our New Products Dual Band Duplex radio the working type is full-duplex,it allows communication in both directions, and, unlike half-duplex, allows this to happen simultaneously. Land-line telephone networks are full-duplex, since they allow both callers to speak and be heard at the same time. A good analogy for a full-duplex system would be a two-lane road with one lane for each direction.

Below is the Difference of Half-Duplex and Full-Duplex