"Police radio" refers to a communication system that allows police officers to talk to each other using wireless devices, like handheld radios, in order to share important information, coordinate actions, and ensure public safety. Full definition
Below is my translation of the sections of the broadcast tape of orders transmitted over police radios at the demonstration, which had stated as its goal to get into the conference center and talk to the leaders gathered there: (dotearth.blogs.nytimes.com)
A television station crew showed up too alerted by a report on police radio scanner! (sunbearsquad.org)
That meant that police radios for Coral Springs and the Sheriff's Office, the first two law enforcement agencies at Stoneman Douglas, had to be connected so officers from both agencies could communicate. (sun-sentinel.com)