Do three-star hotels need a certificate for wireless intercom?

The use of walkie-talkies will involve radios, and you can only use them after applying for permission.

Public intercom (using 409 ~ 4 10 MHz) does not need a license plate; Public network walkie-talkie does not need a license, but it needs to be registered with the network operator; Other walkie-talkies need to be licensed by the local radio management department and pay the annual frequency usage fee.

Working principle of walkie-talkie: By transmitting RF carrier signal, the filter receives the signal, after filtering and frequency discrimination, the audio signal is obtained, and after processing, the voice information people need is obtained.