Kidde Hardwired Smoke Detector 20SAR — 120V with AA Battery Backup, Interconnectable, 85 dB

The Kidde 20SAR is a hardwired home smoke alarm with AA battery backup that detects smoke faster and sounds an 85-decibel alert with a visible red LED.

This single-pack Kidde 20SAR combines 120V AC wiring with two included AA alkaline batteries to keep detection active during power outages. Designed to cut down on nuisance activations, its sensing system distinguishes common cooking or steam from real smoke and is tested to current UL 217 standards. With interconnect capability, multiple Kidde units can trigger together so occupants receive synchronized warnings throughout the house.

How quickly will this detector alert my household?

The 20SAR is engineered for faster response to smoldering fires, showing improved average detection times compared with earlier models. When smoke is detected, the unit emits an 85-decibel alarm and flashes its red LED to ensure both audible and visual notification.

• Detects smoke over 25% faster in smoldering tests versus earlier comparative units.
• 85 dB alarm loud enough to wake sleeping occupants in many home settings.
• Red LED provides a clear visual warning alongside sound.

What happens during a power outage?

This alarm is hardwired to 120V AC for continuous primary power and ships with two AA alkaline batteries installed for backup. If household power is lost, the batteries automatically take over so the detector continues monitoring.

• Connects to standard 120V AC wiring for main power.
• Includes two AA batteries for immediate backup coverage out of the box.
• Battery backup helps maintain detection during outages and wiring interruptions.

Will this unit reduce false alarms from cooking or steam?

The 20SAR uses an advanced sensing algorithm and hardware design to better distinguish nuisance sources like steam or normal kitchen smoke from hazardous smoke. That reduces unnecessary alarms while retaining sensitivity to real danger.

• Sensing technology tuned to limit common false triggers from cooking and bathing steam.
• Maintains rapid response for genuine smoke events despite fewer nuisance activations.
• Recommended placement and installation improve accuracy — see the User Guide for guidance.

How does interconnection work with other alarms?

When interconnected, the 20SAR can trigger other compatible Kidde alarms so the entire system sounds together. This networked response helps ensure occupants throughout a home are alerted simultaneously.

• Supports wired interconnect configurations; check model compatibility and installation requirements.
• One alarm detecting smoke causes all connected alarms to sound for whole-home notification.
• Installation by a qualified electrician or experienced installer is recommended for code compliance.

Who is this for: Homeowners, landlords, property managers, and contractors who need a reliable, code-tested smoke detection solution with wired power and battery backup. The Kidde 20SAR suits installations that prioritize faster detection of smoldering fires, reduced nuisance alarms, and the ability to interconnect multiple alarms for synchronized warnings. It meets current UL 217 testing standards, includes a 10-year limited warranty, and is intended for anyone seeking a durable, maintenance-friendly smoke alarm for residential settings.