First Alert SMI105-AC Interconnect Smoke Alarm – 10-Year Battery Backup (3-Pack)

Protect your home with the reliability of First Alert SMI105-AC Interconnect Hardwire Smoke Alarm. Built to meet current industry standards, this 3-pack works together to provide early warning across rooms, corridors, and living spaces, helping you respond quickly.

Why precision matters

First Alert's Precision Detection technology is designed to deliver faster, more accurate warning while reducing false alarms from common kitchen activities. The result is a more dependable signal during real emergencies without constant interruptions from everyday cooking noises.

• Precise sensing reduces nuisance alarms while maintaining early fire detection
• Interconnect capability ensures synchronized alerts across compatible devices
• End-of-life warning helps you plan replacement before protection lapses

The unit is powered by a built-in 10-year battery backup, providing continuous protection even when the household power is out. This feature helps maintain the integrity of your fire safety system when you need it most.

• 10-year battery backup maintains operation during outages
• Hardwired interconnect enables whole-home alert referencing a single event
• Visual alarm indicator identifies which unit initiated the alert

Interconnection across rooms is straightforward with compatible First Alert alarms. When one device detects smoke, all interconnected alarms will sound, offering broad coverage and a clearer signal path to occupants.

Real-world scenarios where this model shines include busy cooking moments, crowded hallways, and during routine power outages. The combination of a robust detector and networked warnings can provide a measured, actionable notification rather than a jarring, isolated beep.

Installation and compatibility

This hardwired smoke alarm uses a 120V AC supply with a 10-year battery backup and is designed for easy integration within a multi-unit system. The 3-pack helps you cover essential zones (hallways, living areas, and near kitchens) with consistent performance. Each unit features an audible alert, a clear visual indicator, and an end-of-life warning to help you plan ahead.

Key setup notes:

• Interconnects with other compatible First Alert alarms
• Includes mounting hardware and standard wiring requirements
• Easy maintenance with long-care battery backup and clear indicator signals

While no claim guarantees outcomes, the combination of precision sensing, interlinked alerts, and a long-lasting backup offers a practical option for enhancing home safety without relying on uncertain guarantees.