Walkie-talkie (noun)

A portable two-way radio transceiver, typically hand-held, with a push-to-talk button and a built-in speaker and microphone.

Origin:

It was created as a term by the canadian galvin manufacturing corporation (later motorola) to describe its first hand-held two-way radio, the motorola scr-300, which was first marketed in 1940.

Examples:

1. The security guards used walkie-talkies to communicate.
2. The walkie-talkie crackled as the message came through.
3. I reached for my walkie-talkie to call for backup.
4. Walkie-talkies are commonly used by the military and emergency services.
5. The hikers were lost and they were trying to contact rescuers using their walkie-talkies.