Definition: A two-way radio is a radio that can transmit and receive, unlike a broadcast receiver which only receives
content one way. A push to talk button is often present to activate the transmitter. Hand-held portable two-way radios are called walkie-talkies or handie-talkies. Two way radios are available in mobile and stationary base configurations.
An example of a two-way radio that both transmits and receives at the same time (full-duplex) is a cell phone, which uses two different radio frequencies to carry the two directions of the conversation simultaneously.