After nearly a century of development, the application of walkie talkie has been very common, from professional field to ordinary consumption, from military to civil. It is not only a professional wireless communication tool in mobile communication, but also a consumption tool with the characteristics of consumer products that can meet people's living needs. Walkie talkie is a terminal device for one-to-many communication, which can enable many people to communicate with each other at the same time, but only one person can speak at the same time. Compared with other communication modes, this communication mode is characterized by instant communication, one call, economy and practicality, low operation cost, no call cost and convenient use. At the same time, it also has the functions of group call broadcast, system call, confidential call and so on. In dealing with emergencies or dispatching command, its role can not be replaced by other communication tools. Most of the traditional walkie talkies adopt simplex analog communication mode, some walkie talkies adopt frequency division duplex analog communication mode, and digital walkie talkies are widely used in cluster communication, but most of them are frequency division duplex mode. Radio walkie talkies and other wireless communication tools (such as mobile phones) have different market positioning and are difficult to replace each other. Radio walkie talkie is by no means an outdated product. It will be used for a long time. With the economic development and social progress, people pay more attention to their own safety, work efficiency and quality of life, and the demand for radio walkie talkie will also grow day by day. The public's extensive use of walkie talkies has promoted the walkie talkie to become a communication tool that people love and rely on.