Kidde Hardwired Smoke Detector 4-Pack — Interconnectable, Battery Backup

GRADE: A+ — Open Box. Like-new condition with original packaging.

Condition: Open Box. Like-new condition with original packaging.

This Kidde 20SAR hardwired smoke detector 4-pack delivers whole-home fire protection in a single purchase. Each detector connects to 120V AC ceiling wiring. All four units arrive in like-new condition with original packaging intact.

Each smoke detector sounds an 85-decibel alarm when triggered. The alarm pattern is three long beeps. A red LED flashes in sync with the beeps. This combination makes the alert unmistakable day or night. The loud tone ensures people in distant rooms can hear it clearly.

These detectors run on hardwired 120V AC power. Two AA alkaline backup batteries are included per unit. The battery backup activates automatically during power outages. This means your home stays protected even when the grid goes down. Consistent power coverage is one of the most important features a smoke detector can have.

Kidde's enhanced sensing technology is built to reduce false alarms. Cooking fumes are a common trigger for inferior detectors. The 20SAR is tuned to distinguish real smoke from kitchen steam. It meets UL 217 9th Edition standards as well as FCC requirements. These certifications are among the most rigorous in the industry.

The interconnect capability is a standout feature of this 4-pack. When one detector detects smoke, all four sound simultaneously. This gives everyone in the home maximum time to evacuate. Interconnection is achieved through the included quick-connect wire harnesses. Each harness is intact and undamaged, as confirmed by our inspection team.

Three LED indicators keep you informed at a glance. A green light means normal operation. An amber light signals an operating error requiring attention. A red light means smoke has been detected. These visual cues complement the audible alarm effectively. You can check alarm status from across the room without pressing any buttons.

A built-in self-testing mechanism monitors internal components continuously. It ensures each alarm is always operating as expected. This is not a substitute for manual testing, however. Kidde recommends pressing the test button once per week. The test/hush button also silences nuisance alarms quickly when needed.

Each unit measures 5 inches in diameter — a compact, low-profile form factor. The mounting bracket makes ceiling installation straightforward. All four mounting brackets are included and in pristine shape. The 10-year limited warranty begins when the alarm is first powered on. This is one of the longest warranties available on any residential smoke detector.

Kidde is North America's #1 home fire safety brand. The company has over 100 years of experience in life safety products. Learn more about residential smoke detector standards and best practices on the Smoke detector Wikipedia page. Kidde products are trusted by homeowners, contractors, and fire safety professionals alike.

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Frequently Asked Questions

Question 1: Are these detectors truly hardwired, and do they still work if the power goes out?

Answer 1: These are genuine 120V AC hardwired smoke detectors designed for permanent ceiling installation. They require connection to your home's electrical wiring by a qualified electrician. Each unit also includes two AA alkaline backup batteries that activate automatically during any power outage, so protection is never interrupted.

Question 2: What does interconnectable mean, and how many units can be linked together?

Answer 2: Interconnectable means that when one detector in the network senses smoke, every linked detector sounds its alarm at the same time. This is critical in larger homes where a single alarm in one room might not be heard throughout the house. The 20SAR model supports interconnection with other compatible Kidde hardwired alarms — refer to the included user guide for the maximum number of units allowed on a single interconnect loop and for any model compatibility requirements.

Question 3: What is included in this 4-pack, and is everything present?

Answer 3: Each of the four units comes with 2 AA alkaline backup batteries, a mounting bracket, a quick-connect wire harness, and a user manual. All four sets of components are present and accounted for in this listing. Our inspection confirmed that mounting brackets, wire harnesses, and manuals are all included and undamaged.

Question 4: How do the LED indicators work on the Kidde 20SAR?

Answer 4: The 20SAR features three distinct LED notification states to communicate detector status at a glance. A steady green light indicates normal operation and that the detector is functioning correctly. An amber light signals an operating error that should be investigated promptly. A flashing red light, accompanied by three long beeps, means smoke has been detected and you should evacuate immediately.

Question 5: What certifications does this smoke detector carry?

Answer 5: The Kidde 20SAR meets UL 217 9th Edition standards, which is the most current and stringent UL certification for residential smoke alarms. It also complies with FCC standards for electronic devices. These certifications confirm the detector has been rigorously tested for reliable smoke detection, false alarm resistance, and electromagnetic compatibility.

Purchasing a 4-pack is the most efficient way to protect an entire floor or home. Most building codes recommend placing a smoke detector in every bedroom and hallway. This pack covers four rooms in a single order. Having all four units from the same model ensures seamless interconnect performance. It also simplifies maintenance since batteries and replacement schedules are identical across all units.

The open-box condition of this listing means you get a brand-new detector experience at a reduced price. The original packaging is present and the units show no signs of use. Red dust covers on all four units remain attached, confirming they were never installed. Battery pull-tabs are intact on each unit, confirming the backup batteries have never been activated. This is a rare opportunity to get a premium hardwired detector set well below retail.

Kidde's 10-year warranty is transferable and begins at first power-on. Since these units have never been powered on, the full warranty period is available to the buyer. This makes the value proposition exceptionally strong compared to buying new at full retail price. Fire safety is not an area to compromise on — and with this listing, you don't have to.

Urban Supply Plus · Every item professionally inspected & graded · SKU LPNPMUU5281267