A walkie-talkie (more formally known as a handheld transceiver) is a hand-held portable,
two-way radio transceiver. The first walkie-talkies were developed for military use during
World War II, and spread to public safety and eventually commercial and jobsite work after the war. Major characteristics include a
half-duplex channel (only one radio transmits at a time, though any number can listen) and a
push-to-talk switch that starts
transmission. Typical walkie-talkies resemble a
telephone handset, possibly slightly larger but still a single unit, with an
antenna sticking out of the top. Where a phone's earpiece is only loud enough to be heard by the user, a walkie-talkie's built-in speaker can be heard by the user and those in his immediate vicinity. Hand-held transceivers may be used to communicate between each other, or to vehicle-mounted or base stations.
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walkie-talkie, communications device used on the roadways which operates by radio waves
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