Two-way radio
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A two-way radio is simply a radio that can both transmit and receive (a transceiver). Portable two-way radios are often called walkie-talkies or handi-talkies. Two-way radios are also available in mobile and base configurations. An example of a two-way radio that both transmits and receives at the same time (or full duplex) is a mobile phone or cellular telephone, which uses two different radio frequencies to carry the two directions of the conversation simultaneously.