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  2. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

  3. Walkie-talkie - Wikipedia

    en.wikipedia.org/wiki/Walkie-talkie

    Typical walkie-talkies resemble a telephone handset, with a speaker built into one end and a microphone in the other (in some devices the speaker also is used as the microphone) and an antenna mounted on the top of the unit. They are held up to the face to talk. A walkie-talkie is a half-duplex communication device. Multiple walkie-talkies use ...

  4. Zello - Wikipedia

    en.wikipedia.org/wiki/Zello

    Purpose-built to connect frontline teams and communities, the push-to-talk walkie-talkie app offers instant voice communication with one or many in unlimited secure, private channels, as well as message replay, emergency alerts, location tracking, dispatch capabilities, and Bluetooth device support.

  5. Personal radio service - Wikipedia

    en.wikipedia.org/wiki/Personal_radio_service

    Since 3 February 2004, the Infocomm Media Development Authority of Singapore (IMDA) has allocated the 446.0–446.1 MHz frequency band for low-powered walkie-talkies on a non-interference, non-protected and shared-use basis.

  6. Family Radio Service - Wikipedia

    en.wikipedia.org/wiki/Family_Radio_Service

    Motorola T5320 FRS handheld radio. The Family Radio Service (FRS) is an improved walkie-talkie radio system authorized in the United States since 1996. This personal radio service uses channelized frequencies around 462 and 467 MHz in the ultra high frequency (UHF) band.

  7. List of chat websites - Wikipedia

    en.wikipedia.org/wiki/List_of_chat_websites

    Group live video streaming and instant messaging: Yes Yes Yes Yes Yes Yes Yes No BongaCams: One-way webcam model live video streaming: Yes No Yes Yes Yes No No Yes Chat-Avenue: Adobe Flash and PHP-based chat rooms: Yes Yes Yes Yes Yes No No Yes Chatroulette: Two-way live video streaming between random pairs of people No No Yes Yes Yes Yes No ...

  8. Citizens band radio - Wikipedia

    en.wikipedia.org/wiki/Citizens_band_radio

    Before CB was authorized in Australia, hand-held 27-MHz "walkie-talkies" were available, which used several frequencies between the present CB channels, such as 27.240 MHz. [ 18 ] [ 19 ] By the mid-1970s, hobbyists were experimenting with handheld radios and unauthorized 23 channel American CB radios.

  9. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...