The Notifier M721 is an Analogue Addressable Dual Input Monitor and Single Output Relay Module, designed to work with Notifier protocol fire alarm control panels. It features end-of-line resistors, plug-in screw connections, and tri-colour LEDs with isolators for easy installation and clear diagnostics. The M721 offers flexible mounting options, including DIN rail, wall boxes, and dedicated enclosures, saving space and reducing installation costs. It also includes short circuit protection and individually selectable isolators for enhanced system reliability. Built for durability, the Notifier M721 ensures long-lasting performance with quick connectors and laser-engraved data for easy maintenance. Its multi-colour status LED and enlarged light pipes make diagnostics and fault-finding easier, even in tight spaces. The Notifier M721 is a versatile, reliable solution for modern fire alarm systems, offering flexibility, safety, and efficiency.