This is a way of communicating on the half-duplex communication line, includes receiving and transmitting devices (walkie-talkie) by the way of pressing the button for switching to the voice mode or transition to the listening mode. It works as a radio speaker; one can talk by pressing the button and can listen to a voice message by releasing the button.
Coolwave Communications BV is a Netherlands-based telecom operator serving the rapidly growing market for voice,voice-mobile, VOIP, internet, data and fiber services.