---
product_id: 12080212
title: "Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design"
brand: "kidde"
price: "€ 64.38"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.de/products/12080212-kidde-fire-sentry-smoke-detector-9v-battery-powered-smoke-alarm
store_origin: DE
region: Germany
---

# 4-inch compact design 9V battery powered, no wiring 85dB loud ionization alarm Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design

**Brand:** kidde
**Price:** € 64.38
**Availability:** ✅ In Stock

## Summary

> 🔥 Small Size, Big Safety — Stay Ahead of Fire Risks! 🚨

## Quick Answers

- **What is this?** Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design by kidde
- **How much does it cost?** € 64.38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/12080212-kidde-fire-sentry-smoke-detector-9v-battery-powered-smoke-alarm)

## Best For

- kidde enthusiasts

## Why This Product

- Trusted kidde brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power Outage Proof:** Reliable 9V battery operation keeps you protected even when the grid fails
- • **Early Fire Detection:** Ionization sensor spots invisible flaming fires faster for crucial extra seconds
- • **User-Friendly Control:** Test-hush button silences false alarms & confirms battery health with ease
- • **Certified Peace of Mind:** UL listed with a 3-year limited warranty—trusted protection for your home
- • **Compact & Discreet Safety:** Sleek 4-inch diameter fits tight spaces & blends with modern interiors

## Overview

The Kidde Fire Sentry Smoke Detector is a compact, 4-inch ionization smoke alarm powered by a 9V battery, ensuring continuous fire detection even during power outages. Featuring an 85-decibel alarm and a test-hush button, it offers easy installation without wiring and reliable early detection of fast flaming fires. UL listed and backed by a 3-year limited warranty, it’s designed for homes, RVs, and mobile homes where space and safety are priorities.

## Description

Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design

## Features

- At only 4-inches in diameter, this is one of the smallest smoke detectors you can install in your home, RV, and mobile home
- Basic ionization smoke alarm, affordable and simple to use to provide detection of dangerous smoke or fire
- Operating on a 9-volt alkaline battery, the Kidde smoke alarm provides reliable detection of smoke or fire, even during power outages
- Easy installation – this basic smoke detector requires no wiring
- An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
- Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
- UL listed with a 3-year limited manufacturer warranty on alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Kidde |
| Style | Battery Powered Smoke Detector |
| Power Source | Battery Powered |
| Color | White |
| Product Dimensions | 4"D x 4"W x 1.45"H |
| Item Weight | 120 Grams |
| Alarm | fire safety, ionization, battery powered |
| Operating Humidity | up to 85% relative humidity, non-condensing |
| Upper Temperature Rating | 38 Degrees Celsius |
| Sensor Type | Ionization |
| Number of Items | 1 |
| Manufacturer | Kidde Safety |
| UPC | 047871260560 |
| Part Number | 21026056 |
| Item Weight | 4.2 ounces |
| Item model number | i9040 |
| Batteries | 1 9V batteries required. |
| Is Discontinued By Manufacturer | Yes |
| Size | Pro |
| Pattern | Detector |
| Voltage | 9 Volts |
| Item Package Quantity | 1 |
| Cutting Diameter | 2 Inches |
| Certification | certified frustration-free |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Warranty Description | 365 manufacterer |
| Assembled Diameter | 2 Inches |

## Product Details

- **Brand:** Kidde
- **Style:** Battery Powered Smoke Detector
- **Power Source:** Battery Powered
- **Color:** White
- **Product Dimensions:** 4"D x 4"W x 1.45"H
- **Item Weight:** 120 Grams
- **Alarm:** fire safety, ionization, battery powered
- **Operating Humidity:** up to 85% relative humidity, non-condensing
- **Upper Temperature Rating:** 38 Degrees Celsius
- **Sensor Type:** Ionization

## Images

![Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design - Image 1](https://m.media-amazon.com/images/I/516w4aPPZkL.jpg)
![Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design - Image 2](https://m.media-amazon.com/images/I/61fiOoyzxVL.jpg)
![Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design - Image 3](https://m.media-amazon.com/images/I/71THTJNn2XL.jpg)
![Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design - Image 4](https://m.media-amazon.com/images/I/418XYhMEacL.jpg)
![Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design - Image 5](https://m.media-amazon.com/images/I/415sH+LL6bL.jpg)

## Questions & Answers

**Q: Can this del to CA**
A: A new California Law, SB 745 has changed the rules regarding smoke alarms, and requirements for landlords. Starting July 1, 2014, any smoke alarm installed that is solely battery powered MUST contain a non-removable battery that is rated to last 10 years.http://abc7news.com/news/law-bans-sale-of-smoke-detectors-with-replaceable-batteries/891576/

**Q: does this contaian any radioactive material?**
A: Yes it doesThis product is designed todetect products of combustionusing ionisation technology.This product contains 0.9microcurie of Americium 241,a radioactive material.

**Q: Does the alarm go off when there is steam from a shower down the hall?**
A: I hung mine about two (2) feet from my bathroom door and I have never had the alarm go off when I take a shower.  I would have to say, "no."

**Q: It appears listed product dimensions are off. Chart says 7" but others say 4" in diameter. Can someone please advise the depth of the item?**
A: They're Chinese, what do you expect? This unit is 4" in diameter and 1.75" deep. . . kind of off, eh ? . . I kind of like the "compactness"  . . bought 4

## Customer Reviews

### ⭐⭐⭐⭐⭐ SAFETY FIRST
*by K***. on February 2, 2025*

Great product. Great price. I’ve had this same smoke detector in my home for 20 years and it finally wore out. I didn’t want to mess with mounting a new style. Even though the new one (I ordered two) comes with the mount, I was able to attach the new smoke detectors to old mount.

### ⭐⭐⭐⭐⭐ Chase away the meth cookers
*by K***E on March 17, 2024*

Mounting underneath my mailbox so when they light up the smoldering fire all night long with stagnant air that the fire department is protecting with the sheriff department it might get many other to call the fire in . Worth a tryGreat value and batteries includedEasy to installLouder than my siren I had on all night that didn’t work like contacting fire departmentThey got a new plan that’s allowing the corrupt government to keep methville Florida open for businessIt’s insane here

### ⭐⭐⭐⭐⭐ Basic smoke alarm for camper trailer
*by B***Z on February 25, 2025*

Good, basic smoke detector to put up in my camper trailer. Even fit the mount that was already in there.

## Frequently Bought Together

- Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design
- Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
- Amazon Basics 8-Pack 9V Alkaline Batteries, 5-Year Shelf Life - for Smoke/CO Detector, Electronics & Audio

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.de/products/12080212-kidde-fire-sentry-smoke-detector-9v-battery-powered-smoke-alarm](https://www.desertcart.de/products/12080212-kidde-fire-sentry-smoke-detector-9v-battery-powered-smoke-alarm)

---

*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-09*