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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 ...

When the PTT button is pressed, the indicator light lights up red, indicating that the walkie-talkie is in the transmitting state and you can speak at this time.

The phase-locked loop and voltage-controlled oscillator (VCO) generate the transmitted RF carrier signal.

​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.