Hardwired Interconnected Smoke Detectors,Photoelectric Smoke Alarm with 9V Battery Backup,Test/Silence Button, Hard Wired

Based on the search results, it appears that you are looking for a hardwired interconnected smoke detector with a 9V battery backup. Here are some key features to consider:

• Interconnected system: Look for a smoke detector that can be interconnected with other devices to provide a comprehensive fire safety system.
• 9V battery backup: A 9V battery backup provides continuous protection during power outages.
• Photoelectric sensing technology: Photoelectric sensing alarms may detect visible particles (associated with smoldering fires) sooner than ionization alarms.

Some options to consider are:

• Kidde Hardwired Smoke Detector with 9V battery backup
• SITERWELL Hardwired Interconnected Smoke Detector with 9V backup battery
• Clipsal 240V Photoelectric Smoke Alarm with 9V battery backup

It's essential to note that hardwired smoke detectors require installation by a licensed electrician. Be sure to check the manufacturer's instructions and local regulations before making a purchase.