---
title: "Smoke Detector Carbon Monoxide Detector Combo — $18.7M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/smoke-detector-carbon-monoxide-detector-combo"
last_updated: "2026-08-08T14:36:04.273Z"
locale: en
meta:
description: "Niche score 55/100 · $18.7M/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $18.7M/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Smoke Detector Carbon Monoxide Detector Combo — $18.7M/yr Amazon US Niche (2026) - Flapen"
---
# **smoke detector carbon monoxide detector combo**
**Worth a look**
Shows a $18.7M/yr market, but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.
Market size 100Growth 15Conversion 69Competition 70Returns 58Price range 36Avg price 84Brand share 0Review moat 52Quality gap 57
**Market size**
**Incredible****$18.7M**
$18.7M/yr · 4.0M searches
**Avg price**
**Great****$74.66**
avg listing price — sweet spot $15–$100
**Competition**
**Good****43%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Good****6.2%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.7%**
return rate — above 5% kills the launch gate
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Good****1,411.38**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Okay****$16.54–$245.32**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Bad****-20.3%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, smoke detector carbon monoxide detector combo is a $18.7M/yr Amazon United States market (4.0M searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan. Verdict: Worth a look — 55/100.
Data updated Jul 30, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **smoke detector carbon monoxide detector combo market data**
- **Units sold / yr**
- **250K–300K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **$18.7M–$22.4M**
- units × avg price
- **Conversion rate**
- **6.2%**
- **Avg BSR**
- **#14**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **90%**
- **Out of stock**
- **5.1%**
- **Avg brand age**
- **36 months**
- **Avg seller age**
- **139 days**
## **Competition & brand share**
The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**4 **▲rising
**Sellers**
**79**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**43%**
Top 20: 85%
**Open market**
**0%**
- First Alert48% - X-Sense29% - Kidde22% - HEIMAN1%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -20.3% search growth over the last 90 days.
125K75KSpike '24Holiday '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/smoke-detector-carbon-monoxide-detector-combo/trend)
## **Top smoke detector carbon monoxide detector combo search terms**
- **smoke detector carbon monoxide detector combo 10 year battery**1.9M/yr-17.2%5.2% conv. - **smoke and carbon monoxide detector**788K/yr-24.4%4.2% conv. - **carbon monoxide smoke detector combo**207K/yr-15.9%4.9% conv. - **fire alarms smoke detectors carbon monoxide**145K/yr-9.3%3.7% conv. - **smoke & carbon monoxide alarms**124K/yr-15.2%3.2% conv. - **smoke alarm and carbon monoxide detector**137K/yr-32.7%4.7% conv. - **fire and carbon monoxide detector**98K/yr-22.6%3.8% conv. - **smoke and carbon monoxide alarm**76K/yr-9.6%3.4% conv. - **co2 and smoke detector combo**50K/yr-29.0%4.7% conv. - **smoke and co2 detector combo**77K/yr-14.6%3.7% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/smoke-detector-carbon-monoxide-detector-combo/search-terms)
## **Top smoke detector carbon monoxide detector combo products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%3%$561K6%$1.1M9%$1.7M12%$2.2M1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**First Alert Battery Combination Smoke & Carbon Monoxide Alarm**First Alert**$40.00**4.5★969 rev](https://www.amazon.com/dp/B0CY3BZCX9) [2**First Alert 10-Year Battery Combination Smoke & Carbon Monoxide Alarm**First Alert**$39.12**3.8★1,608 rev](https://www.amazon.com/dp/B0CJMMVST2) [3**X-Sense Smoke Detector Carbon Monoxide Detector Combo SC07 1-Pack**X-Sense**$33.56**4.6★4,104 rev](https://www.amazon.com/dp/B09P52JX2R) [4**X-Sense Smoke Detector and Carbon Monoxide Detector SC01 1-Pack**X-Sense**$31.96**4.6★2,271 rev](https://www.amazon.com/dp/B0B48XDLTT) [5**Kidde Smoke & Carbon Monoxide Detector AA Battery-Powered 30CUDR 1 Pack**Kidde**$47.22**4.4★654 rev](https://www.amazon.com/dp/B0CX6L54KV)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**X-Sense Smoke & Carbon Monoxide Alarm SC06 1-Pack**X-Sense**$36.31**245 rev4mo ago](https://www.amazon.com/dp/B0GRGSF49J) [**Kidde Smoke & Carbon Monoxide Detector AA Battery-Powered 30CUDR 3 Pack**Kidde**$133.92**654 rev10mo ago](https://www.amazon.com/dp/B0FFVPFMFR) [**X-Sense Smoke Detector Carbon Monoxide Alarm Combo XP0H-SN 1-Pack**X-Sense**$35.86**131 rev1y ago](https://www.amazon.com/dp/B0CLLVNDPF) [**Kidde Carbon Monoxide Detector AA Battery Powered Portable for Travel or Home 85 dB Alarm LED Status Indicators 3rd Edition**Kidde**$22.91**1,663 rev1y ago](https://www.amazon.com/dp/B0DT1MGCKK) [**Kidde Smoke & Carbon Monoxide Detector AA Battery-Powered 30CUDR 1 Pack**Kidde**$47.22**654 rev2y ago](https://www.amazon.com/dp/B0CX6L54KV)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Kidde Smoke & Carbon Monoxide Detector AA Battery-Powered 30CUDR 3 Pack**Kidde**$133.92**4.4★**▲ 162%**](https://www.amazon.com/dp/B0FFVPFMFR) [**X-Sense Smoke & Carbon Monoxide Alarm SC06 1-Pack**X-Sense**$36.31**4.6★**▲ 149%**](https://www.amazon.com/dp/B0GRGSF49J) [**X-Sense Smoke Detector and Carbon Monoxide Detector SC01 5-Pack**X-Sense**$153.94**4.6★**▲ 138%**](https://www.amazon.com/dp/B0BZR8JQK2) [**First Alert Hardwire Combination Smoke & Carbon Monoxide Alarm**First Alert**$245.32**4.5★**▲ 93%**](https://www.amazon.com/dp/B0CLVS37Z9) [**Kidde Smoke Detector AA Battery-Powered 20SDR 1 Pack**Kidde**$28.88**4.4★**▲ 85%**](https://www.amazon.com/dp/B0CX6RMV4B)
**~~View all trending →~~**
## **What buyers say about smoke detector carbon monoxide detector combo**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**25%
*“Ease of installation”*
**Quality-Overall**11%
*“The build quality feels solid”*
**Value For Money**9%
*“Excellent value”*
**Advertised Vs Actual Product**9%
*“Exactly what I wanted”*
**Efficiency**5%
*“Unit works fine”*
**Battery Life**5%
*“good battery life”*
**Alarm/Timer Accuracy**3%
*“so far no false alarms”*
**Sensor**3%
*“These combination detectors are really good”*
**Ease Of Use**3%
*“Easy peasy”*
**Security**3%
*“Keep your family safe”*
### **What buyers complain about **
**Durability**24%
*“Failed after about 12 months”*
**Battery Life**12%
*“Battery was dead when received”*
**Quality-Overall**9%
*“Bad quality”*
**Functionality-Overall**8%
*“Did not work”*
**Noise Level**7%
*“Loud”*
**Value For Money**5%
*“Nearly half price as box store”*
**Alarm/Timer Accuracy**5%
*“Defective alarm”*
**Assembly/Installation**2%
*“Tricky to install”*
**Size-Overall**2%
*“which in turn is slightly smaller”*
**Advertised Vs Actual Product**2%
*“Not as described”*
### **Top return reasons **
**Alarm/Timer Accuracy**29%
**Compatibility-Overall**12%
**Connectivity-Overall**11%
**Functionality-Overall**8%
**Value For Money**8%
**Size-Overall**8%
**Advertised Vs Actual Product**7%
**Defective Material/Parts**3%
**Product Condition**2%
**Assembly/Installation**2%
## **Common questions**
- **Is smoke detector carbon monoxide detector combo profitable to sell on Amazon United States?**
- The niche generates $18.7M/yr across 39 tracked products. 6 of 6 products launched in the last 360 days are still selling. 90-day search growth is -20.3%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the smoke detector carbon monoxide detector combo niche?**
- 4 brands and 79 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in smoke detector carbon monoxide detector combo?**
- Top complaints mined from reviews: Durability, Battery Life, Quality-Overall. The return rate is 2.7%.
- **When does demand for smoke detector carbon monoxide detector combo peak?**
- Demand peaks in Jan; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the smoke detector carbon monoxide detector combo niche?**
- Listings span $16.54–$245.32; the average listing price is $74.66 (sweet spot $15–$100). The average incumbent carries 1,411 reviews — the moat a new listing must climb.
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