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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.

Since 1993, Lisheng Communication Co., Ltd. has gone through 30 years and has experienced countless challenges and opportunities ...

The walkie-talkie is a terminal device for cluster communication. It can not only be used as a terminal device for cluster communication, but also can be used as a professional wireless communication tool in mobile communications.

In the fast-paced world of communications, the need for reliable and efficient communication tools continues to grow. Handheld radio repeaters are one such tool that is making waves in the industry.

​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.

​Car walkie-talkie is a very useful communication tool that can help drivers and passengers communicate effectively while driving. The walkie-talkie in the car is usually called a car walkie-talkie. It is a portable communication device that can be installed in the car to provide wireless communication functions for the vehicle.