Kidde 20SAR Hardwired Smoke Detector 3 Pack
- Power Source: Corded Electric
- Sensor Type: Photoelectric
- Alarm: Audible
- Product Style: 9th Edition
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
The right choice for a multi-room, wired alarm system where one alarm should trigger all of them. Skip it if the home has no smoke alarm wiring already in place.
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ASIN: B0FFVRMPZHModel: 20SARCategory: Smoke Detectors & Fire Alarms
Overview
A three-pack of Kidde smoke alarms that hardwire into 120V household power with AA battery backup, so they keep working through an outage. Units interconnect, meaning if one detects smoke, every connected alarm in the pack sounds together.
This is the option built for whole-home coverage rather than a single room: three interconnected, hardwired units that can be placed in bedrooms and hallways so one triggering sounds all of them. It needs existing 120V wiring at the alarm location, a bigger install step than the battery-only Kidde models in this line, but it removes the single point of failure a standalone alarm has. AA batteries only serve as backup power during an outage, not the primary source.
- Hardwired to 120V with AA battery backup
- Interconnect capability links all units together
- Three-pack for whole-home coverage
- UL 217 10th edition and FCC tested
Who it's for
Homeowners replacing an existing hardwired, interconnected smoke alarm system, or anyone wiring alarms across several rooms who wants one alarm to alert the whole house. Not a fit for renters or anyone without access to 120V wiring.
Pros and cons
- Three units cover multiple rooms at once
- Interconnect wiring sounds every unit together
- AA battery backup keeps it working in an outage
- Requires existing 120V wiring to install
- Not a simple battery-only, no-wiring setup
Performance notes
Each unit runs on 120V household power with two AA batteries as backup, so detection continues through a power outage. The interconnect wiring lets any alarm in the pack trigger the rest, the main advantage over standalone battery units when a fire starts in a room without anyone nearby. The line is tested to UL 217 10th edition and FCC standards.
Specifications
| Brand | Kidde |
|---|---|
| Model | 20SAR |
| Dimensions & fit | |
| Item Dimensions D X W X H | 1.9 × 5 × 5 inches |
| Capacity & performance | |
| Upper Temperature Rating | 100 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Enclosure Material | Plastic |
| Color | White |
| Included components | |
| Unit Count | 3 |
| Warranty & support | |
| Manufacturer Warranty Description | 10-Year Limited Warranty |
| Other details | |
| Sensor Type | Photoelectric |
| Alarm | Audible |
| Product Style | 9th Edition |
| Number Of Items | 3 |
| Mfr Part Number | 21033883 |
| Builtin Media | Mounting Base, Mounting Screws, Three Alarms, User Guide |
| Item Type Name | Smoke Detectors |
| Operating Humidity | Up to 95% relative humidity (RH), non-condensing |
| Item Highlight | Wired Interconnect Capability, LED Status Lights And Loud 85 Db Alarm, Ideal For Homes And Apartments |
Frequently asked questions
Can the Kidde 20SAR run on batteries alone?
No. It is hardwired to 120V household power; the AA batteries are backup power for outages only.
Do all three alarms in the 20SAR pack sound together?
Yes, the interconnect capability means when one unit detects smoke, every connected unit in the pack sounds.
What is included in the 20SAR 3-pack?
Three hardwired smoke alarms, each with AA battery backup, sold as one interconnect-ready set.