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In the amateur section, there are very strict norms, and they will be specially trained when testing. At 409m exemption, there are the following provisions: 1.Do not change the transmitting frequency and increase the transmitting power (including additional radio frequency power amplifier) without authorization. 2.Do not cause harmful interference to various legitimate radio business when using. Once harmful interference is found, use it immediately, and take measures to eliminate interference before continuing to use it; *Using public intercom, its communication quality is not protected by radio management agencies, and the radio business that may work normally should be caused by other normal jobs; 3.It is forbidden to use on the airport and aircraft; 4.It is forbidden to interconnect with the public telephone network, public mobile communication network and other telecommunications networks.

Many users don't know how to "pair" channels when using walkie-talkies. Next, let's learn about the related knowledge.

Portable repeaters have become an important tool for communications in various industries including emergency response, construction and outdoor activities. These devices are designed to extend the range of two-way radios, ensuring seamless and reliable communications over long distances. In recent news, the use of portable repeaters has made headlines for their role in enhancing communications capabilities in challenging environments.

​One of the biggest advantages of DMR radios is their ability to transmit digital audio signals. Unlike analog signals, digital audio signals are less likely to be distorted by background noise or interference from other radios.

​DMR, or Digital Mobile Radio, is a technology that allows for efficient and flexible communications over long distances. It offers superior sound quality, advanced features, and enhanced privacy and security compared to traditional analog radios.

Intercoms play a vital role in all fields of modern society, and their wide range of usage scenarios provide efficient and stable communication guarantees for work and activities in different industries.