A sound source such as a Compact Disc player or radio may be connected to a PA system so that music can be played through the system. … Public address systems consist of input sources, amplifiers, control and monitoring equipment, and loudspeakers.

Surveillance cameras are video cameras used for the purpose of observing an area. They are often connected to a recording device or IP network and may be watched by a security guard or law enforcement officer.

A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. … Fire alarm warning devices can also be set to different volume levels.

A nurse call System is a System found around a hospital bed that allows patients in health care settings to alert a nurse or other healthcare staff member remotely of their need for help.

A video conferencing system is a technology that allows individuals or groups to hold virtual meetings, discussions, and presentations over the Internet. These systems aim to simulate face-to-face interactions as closely as possible, bridging the gap between physical distances and enabling real-time communication.