Wireless radiosmean either a radio that works without the use of wires or it could mean the latest versions of radios that perform using the net connections. There is a misconception about the radio and the wireless being two different commodities. This works on the same principle that a radio officer in the marine mode of transport uses to send messages or the telegraphs work using the Morse code.
A modified version of this is the two way radio, available in both models. This form of radio can send and receive messages at the same time using two wave lengths at the same time, without the transmission tower... Safe radio, a variant of the two way radio is used by people working in areas like the oil refinery; rig or where the explosives are stocked and has the user's safety as first priority.
Police radio is specially designed for the police headquarters, to send or receive calls from the squad on the move and address or alert the public. The professionals use this licensed brand to communicate with their teammates at work in different sites. The English police force was the first to use this model in the late sixties. A variation of this is the Covert Radio or the radio for security and vigilance devised to be worn by the user. This has a microphone to be worn behind shirt collar and transmission kit covered with a leather belt and concealed wires, a bigger version of covert radio is slung to the side of the torso; fastened with straps to the shoulder and the start button is kept in the palm in both cases.
With the changing times and the popular use of the internet has transformed the performance of the radio transmission resulting as digital radio is a product of Pure.