Easy to install hardwired smoke alarms meets new construction requirements. The BRK 9120B smoke sensor is the most accurate sensor available and can use a 9V alkaline battery as a backup. Smoke sensors are important for use in residential and commercial buildings.

• Interconnectable - Can be interconnected with up to 12 smoke alarms and the remaining six can be a combination of heat alarms, CO alarms and relays
  
• 9-volt backup battery (included) for constant monitoring
• Intelligent Sensing Technology - Reduces the number of non-emergency or "nuisace" alarms
• Single Button Test/Silence
  
• Dust Cover
• Single button test/silence
• 10-Year Limited Manufacturer Warranty