Kidde 20SAR-W Hardwired Smart Smoke Detector
- 120V AC hardwired, 2 AA backup batteries included
- Photoelectric sensor, fewer cooking nuisance alarms
- 2.4 GHz Wi-Fi app alerts, hush from the phone
- Interconnected, alerts for linked Kidde hardwired alarms
- UL 217 8th and 9th Edition, FCC
- End-of-life beep at 10 years
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A smart upgrade for homes with Kidde hardwired alarms, adding phone alerts and remote hush. It detects smoke only and needs existing house wiring.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0F7JNJ2CLModel: 20SAR-WCategory: Smoke Detectors & Fire Alarms
Overview
A photoelectric sensing chamber watches for smoke in this Kidde hardwired alarm, with enhanced sensing aimed at cutting false alarms from cooking. Wi-Fi links it to the Kidde app, so smoke and low battery alerts reach the phone at home or away.
One smart unit can bring phone alerts to an existing network of Kidde hardwired alarms, with no extra hub. It needs house wiring and the lower Wi-Fi band, and it senses smoke only, not carbon monoxide.
Who it's for
Homes already wired with Kidde hardwired alarms can swap in one unit to get phone alerts across the system. Renters without hardwired alarm circuits, or anyone needing CO detection in the same device, should choose differently.
Pros and cons
- Phone alerts for linked Kidde alarms
- Hush false alarms from the phone
- Fewer cooking false alarms
- Battery backup included
- Smoke only, no CO sensing
- Requires a hardwired circuit
- Needs the lower Wi-Fi band
- Warranty not listed
Performance notes
Detection relies on a photoelectric sensor whose enhanced sensing is aimed at reducing cooking-related false alarms. Mains power runs it day to day, with backup batteries carrying it through outages. App alerts depend on the home Wi-Fi staying up.
Specifications
| Brand | Kidde |
|---|---|
| Model | 20SAR-W |
| Dimensions & fit | |
| Item Dimensions D X W X H | 2 x 5 x 5 inches |
| Item weight | 1.2 lb |
| Capacity & performance | |
| Upper Temperature Rating | 100 F |
| Power & efficiency | |
| Power Source | 120V AC hardwired, 2 AA backup batteries |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Kidde hardwired alarms (interconnect) |
| Connectivity protocol | 2.4 GHz Wi-Fi, Kidde app |
| Other details | |
| Sensor Type | Photoelectric |
| Alarm | Audible |
| Builtin Media | Smoke alarm, mounting bracket, wiring harness, 2 AA batteries, user and quick start guides |
| Operating Humidity | Up to 95% RH, non-condensing |
| Service life | Replace 10 years after power-on |
| Specification met | UL 217 8th and 9th Edition, FCC |
Frequently asked questions
How big is the Kidde 20SAR-W smart smoke alarm?
It measures 2 inches deep by 5 inches wide by 5 inches high and weighs 1.2 pounds.
Will the Kidde smart alarm work with my existing Kidde hardwired alarms?
Adding one Kidde smart alarm gives mobile alerts for every hardwired alarm in the home, but Kidde notes that different models offer different interconnection options, so check the user guide.
Does the Kidde 20SAR-W need a hub?
No additional devices are required. Setup runs through the Kidde app over 2.4 GHz Wi-Fi.
What is in the box with the Kidde 20SAR-W?
The smoke alarm, a mounting bracket, a wiring harness, two AA batteries and the user and quick start guides.