What is a key requirement for all alarm systems?

A key requirement for all alarm systems is the inclusion of a backup power supply. Alarm systems are designed to function continuously and reliably, especially in emergencies. A backup power supply ensures that the system remains operational in the event of a power failure. This is crucial for maintaining functionality during critical situations, as an alarm system may need to alert occupants or first responders at any time.

Without a backup power supply, an alarm system could fail to activate or notify individuals during a power outage, significantly increasing the risk during emergencies. Other features, while beneficial for specific situations or system types, do not serve as fundamental requirements across all alarm systems. For instance, a manual reset feature or remote monitoring capabilities might enhance usability or response options but do not directly address the essential need for the alarm system to remain operational at all times.