A walkie-talkie is a type of two-way radio, used for communication over a relatively short distance, typically within a single building. In this application, it is used to connect devices in the same Wi-Fi network.

The basic operation of a walkie-talkie is similar to a one-way radio, in that a signal is sent from the device to a receiver, and only those devices that are within a specific distance of the receiver can communicate. In contrast to the walkie-talkie, a one-way radio is typically designed for use within a single building or within a limited area, such as a factory.