Which of the following is true regarding the characteristics of a notification appliance?

Notification appliances are crucial components in systems designed to alert individuals in case of emergencies, such as fire or security threats. The correct choice highlights an essential characteristic of these devices: their ability to operate on both alternating current (AC) and direct current (DC) power.

This versatility is important because notification appliances need to function effectively in various installations, which may have different power supply requirements. Some systems are designed to work with AC power, typically derived from building electrical systems, while others may rely on DC power, often supplied by batteries or specific power supplies designed for low voltage systems. This dual operational capability ensures that notification appliances can be integrated into a wide range of systems and remain functional during power outages if battery backup is utilized.

While other characteristics mentioned, such as minimum loudness ratings or nameplate requirements, may apply to specific jurisdictions or types of appliances, they do not universally define all notification appliances. It is also inaccurate to limit the function of these devices to only indicating fire alarms, as many notification appliances can be used for various alerts, including security alarms and other critical notifications.