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See if the extreme communication distance of the intercom or the tall building is blocked in the basement. If not, please contact the local authorized maintenance station or return to the factory for maintenance.

In order to ensure the security of the communication business of the special department, the national radio management department specifically planned several groups for its use. The frequency range ranges from 350 ~ 390MHz. Its 350MHz ~ 370MHz is mainly used for public security systems.

It is a special intercom specialized in the actual work needs of the railway and the railway department. The launch power is 4-5W and the frequency range is 440-470MHz.

Shipbuilding intercom is a du of the walkie -talkie DU for professional and strong BAI. Its environmental environment is harsh and the temperature at sea has changed greatly. The operating frequency range of the dealer TX was from 156.025MHz-157.425MHz, and RX from 156.050MHz-163.275MHz.

The frequency band of hotel intercom is generally: 400 to 470MHz.

Frequency frequency: 350m frequency band.