nurse call

A nurse call button is a button or cord found in hospitals and nursing homes, at places where patients are at their most vulnerable, such as beside their bed and in the bathroom. It allows patients in health care settings to alert a nurse or other health care staff member remotely of their need for help. When the button is pressed, a signal alerts staff at the nurse's station, and usually, a nurse or nurse assistant responds to such a call. Some systems also allow the patient to speak directly to the staffer; others simply beep or buzz at the station, requiring a staffer to actually visit the patient's room to determine the patient's needs.
The call button provides the following benefits to patients:

Enables a patient who is confined to bed and has no other way of communicating with staff to alert a nurse of the need for any type of assistance
Enables a patient who is able to get out of bed, but for whom this may be hazardous, exhausting, or otherwise difficult to alert a nurse of the need for any type of assistance
Provides the patient an increased sense of security
The call button can also be used by a health care staff member already with the patient to call for another when such assistance is needed, or by visitors to call for help on behalf of the patient.

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