The main wireless unit PTS-SR330 receives calls and displays their number (Caller ID) on its screen. The call may be accompanied by an audible alert, selecting from pre-installed ringtones or by entering your own custom sound. The monitor is placed at a fixed point, usually at a central workstation. In the case of large buildings, such as hospitals, one unit per floor can be installed, with each unit receiving calls from the specific floor. In addition, it covers the need for internal communication between staff members as it can be used along with the Controllers. It offers effective coverage even over long distances thanks to its range, providing a means for prompt service and efficient internal communication.