What type of audible notification appliances are acceptable in a security system?

The choice of self-contained sirens as acceptable audible notification appliances in a security system is grounded in their design and functionality. Self-contained sirens are specifically tailored for integration with alarm systems, providing a loud and immediate alert upon detection of an intrusion or breach. Their capability to emit a distinct sound makes them effective for drawing attention and notifying occupants or passersby of a potential threat.

Self-contained sirens often come with features that ensure they are reliable in various environmental conditions, are easy to install, and require minimal maintenance. These characteristics enhance their suitability as a primary method of audible notification. Furthermore, they are designed to work seamlessly with other components of a security system, ensuring a comprehensive approach to alerting that integrates well with visual and other sensory notifications.

In contrast, while other options such as bell alarms or remote sirens might offer some level of notification capabilities, they may not be as effective or commonly utilized within contemporary security system designs as self-contained sirens. Mobile device alerts can provide notifications but do not serve as a physical alarm within the premises, which can sometimes lead to delays in response to a threat. Therefore, self-contained sirens stand out as the most effective and widely accepted option for audible notification in a security system.