









🔥 Stay ahead of danger with Kidde’s smartest, longest-lasting alarm! 🚨
The Kidde Wireless Hardwired Smoke Detector combines advanced photoelectric and electrochemical sensors to detect smoke and carbon monoxide with precision. Powered by a 120V hardwired source and backed by a 10-year sealed lithium battery, it delivers reliable protection with voice alerts and an 85-decibel alarm. Its wire-free interconnect feature allows linking up to 24 devices, creating a comprehensive safety network without extra wiring. Designed for modern homes, it includes ambient light sensing to prevent nighttime disturbances and LED indicators for clear status updates.



| Brand | Kidde |
| Style | Hardwired Combination Carbon Monoxide & Smoke Detector |
| Power Source | Hardwired |
| Color | White |
| Product Dimensions | 5.59"D x 5.59"W x 1.91"H |
| Item Weight | 0.6 Pounds |
| Alarm | Audible |
| Operating Humidity | 10% to 95% relative humidity, non-condensing |
| Compatible Devices | Up to 24 Kidde devices |
| Upper Temperature Rating | 100 Degrees Fahrenheit |
| Sensor Type | Electrochemical |
| Global Trade Identification Number | 00047871273232 |
| Material | Plastic |
| Number of Items | 1 |
| Manufacturer | Kidde |
| UPC | 047871273232 |
| Part Number | 21027323 |
| Item Weight | 9.6 ounces |
| Item model number | p4010ACSCO-W |
| Batteries | 1 Product Specific batteries required. (included) |
| Is Discontinued By Manufacturer | Yes |
| Pattern | Detector |
| Shape | Circular |
| Voltage | 120 Volts (AC) |
| Installation Method | Mounted |
| Item Package Quantity | 1 |
| Cutting Diameter | 5.59 Inches |
| Usage | Inside |
| Included Components | mounting bracket, mounting hardware, wiring harness, Combination CO & Smoke Alarm, Quick Start Guide |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium Metal |
| Warranty Description | 10 year limited |
| Assembled Diameter | 5.59 Inches |
C**R
Easy to install and set up
Installed two of these wired smoke/CO detectors to replace old hardwired smoke alarms and added two additional wireless units along with several wireless smoke-only alarms. All quickly and easily interconnected during the setup process. Unlike some other commenters, there have been no false alarms. I got these for the 10 year sealed battery that is now required in my county and wanted the interconnect feature so all units will sound in the event of an alarm. The only negative is that the smoke-only units do not sound a CO alarm from an interconnected CO detector.
L**T
Frequent False Alarming
I don’t know what the deal is with these smoke alarms, but they have been terrible for us. We ordered 6 of them and placed throughout our house from the finished basement through the second floor bedrooms. Installation was easy enough and they connected to each other well. Things were fine for a couple months. Then, all of a sudden they started going off, usually at night and without any indication of fire. We contacted the company and were told to vacuum/wipe out the units as dust may cause them to go off. We did this to each one, but they continued to go off at night (usually multiple times). We contacted the company again and they sent new units. The false alarms STILL happened. It’s maddening, we have kids who wake up each time scared there is a fire and each time my husband has to walk around the house and pull down the alarms to make them stop. I’m not sure if humidity has something to do with this because the most false alarms seem to happen after it rains and at night when humidity is generally higher where we live (but we don’t exactly live in a very humid area to begin with, so I have no idea). We’ve driven ourselves crazy trying to figure out what the issue is, my husband is an engineer and he’s baffled. Based on our experience, we would not recommend these at all!!
S**S
Simple install, mix and match AC & Battery models in P4010* Range
The media could not be loaded. I was looking for something that would1) be able to interconnect to other modules,2) have both AC and Battery Models,3) have Combo Smoke/CO and Smoke only models in both power variants4) Interface to the SmartThings for my Alarm System and Smart Notification** A True 'Device to SmartThings' integration - NOT a Listener device that reacts when it 'hears' an audible alarm going offI could not find any other system that actually checks ALL those boxes. And for factor 4 taken by itself, there is only one other brand that achieves that, but does not meet the other requirements.However with this Kidde Series factors 1-3 are present out of the box and even the last part (SmartThings Integration) was actually easy to achieve with some extra parts.So I have Multiples of AC Combo, AC Smoke, DC Combo and DC Smoke - they all interconnect wirelessly and when one alerts they all go off.Now for the SmartThings part - I found a guide on SmartThings community on how to do that (search "Integrating Kidde Smoke/CO sensors into SmartThings") - the extra parts comprised a Kidde SM120X Relay, a Kidde CO120X Relay, a junction box and a pair of EcoLink Zwave Door/Window sensors - everything available right here on Amazon! I won't go into the details here, but it is a very simple install and you don't have to run any wires between modules - the only requirement is that you have at least ONE P4010AC* unit to connect the relay modules.The video shows the test function being activated on one Module and the Status showing on my SmartThings Screen (so from there I can receive notification to my Phone if I am not home, or have other Smart Actions, like turning on the lights etc in an event)The result is my home has gone from a mishmash of very much 'dumb' plain old AC Smoke units (about 30 yrs old!), some 9V Battery Smoke units (20 years old) and newer 10yr battery CO modules - NONE of which were interconnected, to a super-smart Interconnected system that very much meets todays standards.A very fun project to include the SmartThings Integration, however even without that, creating an interconnected Network of Detectors is very simple to achieve.Just to offer some clarification on some of the questions I see asked:The AC Modules (with battery backup) will NOT operate for 10 years without power being applied - estimated operation without AC is about a week I believe. (only intended to maintain operation for typical power outage situations) Get the DC modules if you can't provide AC Power - those WILL last 10 years (guaranteed to!)Interconnecting with other Kidde Alarms - ONLY the AC Modules can be connected by virtue of the hard-wire run to them - they cannot communicate wirelessly with other Modules that are not in P4010* Series. However the Battery Models will be part of the Network as long as there is an AC P4010* that has been physically connected to those non-P4010* series Models.Important to note that the Battery Models of the P4010DC* Series have no wired interconnect AT ALL and will ONLY interconnect to other P4010* Series (whether AC or DC)
P**.
Reliable and Convenient with Voice Alerts
I recently purchased the Kidde Wireless Hardwired Smoke Detector with 10-Year Battery Backup, Voice Alerts, and Photoelectric Sensor, and overall, it has been a reliable and convenient addition to my home safety setup.The 10-year battery backup feature provides peace of mind, ensuring continuous protection even during power outages. The photoelectric sensor offers reliable detection, promptly alerting me in case of any potential smoke or fire hazards.One standout feature is the voice alerts, which provide clear and informative notifications. This adds an extra layer of safety, allowing for quick action and evacuation if necessary. The voice alerts are particularly helpful in a large home or for those who may have difficulty hearing standard alarms.Installation was straightforward, thanks to the wireless connectivity and compatibility with existing hardwired systems. The included mounting hardware and clear instructions made the process hassle-free.However, I did encounter some minor issues with false alarms. Occasionally, the detector would trigger an alarm without any apparent smoke or fire. While this was concerning, it did not happen frequently enough to significantly impact my overall satisfaction with the product.In summary, the Kidde Wireless Hardwired Smoke Detector offers reliable detection, convenient voice alerts, and a long-lasting battery backup. Despite occasional false alarms, it remains an effective and valuable component of my home safety measures. I recommend it to those seeking a reliable smoke detector with added convenience features.
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