---
product_id: 343261067
title: "Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro"
brand: "kidde"
price: "491 kr"
currency: ISK
in_stock: false
reviews_count: 8
url: https://www.desertcart.is/products/343261067-kidde-i9040-fire-sentry-battery-operated-ionization-sensor-compact-smoke
store_origin: IS
region: Iceland
---

# Compact 4-inch diameter Loud 85dB alarm for instant alerts Battery-powered 9V for outage-proof safety Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro

**Brand:** kidde
**Price:** 491 kr
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Stay safe, stay sleek — compact fire protection that never quits! 🔥

## Quick Answers

- **What is this?** Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro by kidde
- **How much does it cost?** 491 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/343261067-kidde-i9040-fire-sentry-battery-operated-ionization-sensor-compact-smoke)

## 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:** Runs on a 9V alkaline battery, ensuring continuous protection even when the power’s out—no wiring needed.
- • **Discreet & Space-Savvy:** At just 4 inches wide, it blends seamlessly into any room or RV without cramping your style.
- • **Instant Fire Detection:** Ionization sensor technology detects fast-flaming fires early, giving you precious seconds to act.
- • **Certified Peace of Mind:** UL certified with a 3-year limited warranty, so you can trust your safety is in expert hands.
- • **Effortless Installation:** Surface-mount on walls or ceilings with zero wiring hassle—perfect for busy professionals on the go.

## Overview

The Kidde i9040 is a compact, battery-operated ionization smoke detector designed for reliable fire detection in homes, RVs, and mobile homes. Featuring a 4-inch diameter, 9V battery power for uninterrupted operation during outages, and a loud 85dB alarm, it offers easy, wire-free installation and meets UL safety standards with a 3-year warranty.

## Description

The Kidde Fire Sentry Smoke Detector, 9V Battery Powered Smoke Alarm, 4 Inch Compact Design, model i9040, features ionization sensor technology to help protect you and your family from the dangers of smoke and fire. Kidde strongly recommends that both ionization and photoelectric smoke alarms be installed to help ensure maximum detection.Kidde’s four-inch smoke detector is smaller in diameter giving it a discreet design perfect for each level of your house including bedrooms, guest rooms, basements, dining rooms, furnace rooms, utility rooms, and hallways.The Kidde Fire Sentry smoke detector is easy to install with no wiring required. Powered by a 9-volt battery (included) that provides reliable detection even during a power outage. This smoke alarm is equipped with a flashing red LED and will flash to indicate the smoke alarm is receiving power. A fresh battery should last for one year under normal operating conditions. Low battery alert tells you when it’s time for a new battery.The smoke alarm is operating once a fresh battery is installed and testing is complete. To ensure proper installation, the test/silence button’s first alert will electronically simulate the presence of smoke and cause the alarm to sound. When fire particles are detected, the unit sounds a loud 85db pulsating alarm until the air is cleared.The Hush® feature has the capability of temporarily desensitizing the alarm circuit for approximately 8 minutes. The smoke alarm will automatically reset after approximately 8 minutes and sound the alarm if particles are still present. The Hush feature can be used repeatedly until the air has been cleared.After 10 years, the smoke alarm will need to be disposed of and replaced. UL Certified with a 3-year limited warranty. Meets requirements of UL217, NFPA72, NFPA 101, FHA, & HUD. For questions or for more information, call the Kidde consumer hotline at 1-800-880-6788.

## 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
- Operating on a 9-volt alkaline battery, the Kidde smoke alarm provides reliable detection of smoke or fire, even during power outages
- Installation is easy, no wiring required. The alarm can be installed on the surface of any wall or ceiling
- Uses ionization sensing technology to detect smoke from flaming fires and emits a loud 85 decibel alarm when fire particles are detected
- UL Certified, 3-year limited warranty
- Battery operated 9V battery included
- Test button tests unit's electronic circuitry horn and battery function
- Four inch diameter discreet design
- Easy installation
- Meets the UL requirements and widely-accepted safety standards

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Kidde Safety |
| Part Number | 21026056 |
| Batteries | 1 9V batteries required. |
| Item model number | i9040 |
| Size | Pro |
| Colour | White |
| Style | Battery Powered Smoke Detector |
| Power Source | Battery Powered |
| Voltage | 9 Volts |
| Item Package Quantity | 1 |
| Cutting Diameter | 2 Inches |
| Certification | certified frustration-free |
| Batteries included? | No |
| Batteries Required? | Yes |
| Assembled Diameter | 2 Inches |
| Item Weight | 120 g |

## Product Details

- **Brand:** Kidde
- **Style:** Battery Powered Smoke Detector
- **Power source:** Battery Powered
- **Colour:** White
- **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

## Images

![Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro - Image 1](https://m.media-amazon.com/images/I/516w4aPPZkL.jpg)
![Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro - Image 2](https://m.media-amazon.com/images/I/61fiOoyzxVL.jpg)
![Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro - Image 3](https://m.media-amazon.com/images/I/71THTJNn2XL.jpg)
![Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro - Image 4](https://m.media-amazon.com/images/I/418XYhMEacL.jpg)
![Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke Detector Alarm, White, Pro - Image 5](https://m.media-amazon.com/images/I/415sH+LL6bL.jpg)

## Questions & Answers

**Q: is the alarm bs approved**
A: The following are found on the User's guide:-UKAS:-United Kingdom Accreditation ServiceCompanyThe United Kingdom Accreditation Service is the sole national accreditation body recognised by the British government to assess the competence of organisations that provide certification, testing, ... WikipediaHeadquarters: London, United KingdomFounded: 1995LPCB:-Fire and security certificationBRE Global Loss Prevention Certification Board (LPCB) has been working with industry and government for more than 100 years to set the standards necessary to ensure that fire and security products and services work effectively. In that time the LPCB Mark has become an internationally recognised mark of trust.Under the LPCB brand, we offer independent, third-party certification and listing of fire and security products and services, so that:architects and specifiers can be sure that those they select will perform as required, and manufacturers and suppliers can demonstrate the quality of their products and services.FireWe rigorously assess and approve fire safety products and their installation against published standards including British Standards, European Standards and LPCB Loss Prevention Standards (LPS). The fire resisting products, fire detection and alarm systems and installers listed in the LPCB Red Book, will give you confidence that the fire risks in the buildings you are designing, specifying or managing have been minimised.SecuritySecurity products and services approved by LPCB and listed within the Red Book play a very important role in protecting people and property against crime, particularly burglary and vandalism.Hope this helps.

**Q: Does it have a flashing light on it?**
A: Yes, it does have a flashing light on it, but it's not a constant flash, just every so many seconds, so not annoying but reassuring enough to know that it is working.

**Q: can it be wall mounted**
A: thank you for answering my request, 'to be wall mounted'. much obliged .

**Q: what is the difference between size "normal" and "a". If diff diameters could you give me the sizes. Thanks**
A: dont know.  Normal is 4 inches diameter.  Size is only important if mounting new alarm on an existing back plate - they obviously need to fit.  There is a 5 inch model I believe.  Worst case scenario if exg back plate won't fit is remove exg backplate and fit the one that comes with the new alarm.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Clean appearance, and good value for money
*by J***8 on 12 February 2015*

Simple to install and batteries seem to last and last, but when they're low, it chirps to let you know. It does not look too obtrusive either, which is good as some smoke alarms can be quite large and ugly to look at.I don't see any reason why you should be concerned as to the reliability of these, but if you are, then you could mix brands of smoke alarms around your house.I would highly recommend grabbing some if you don't have any and while you are at it, look at buying some 9v batteries off Amazon to stock up.

### ⭐⭐⭐⭐ Smoke alarm - safety first
*by O***G on 24 December 2012*

Got this, didnt use the little raw plugs and screws it came with as I already have a little hook in place (to replace my old one).This seems to work well ie not go off when I slightly burnt my toast. press the test button all seems fine. quite discreet. Will never know how good any smoke alarm is until it goes off for a fire - which I hope I never find out.However im pleased with this purchase.

### ⭐⭐⭐⭐⭐ This does what is says on the packet. Made from good quality materials and arrived promptly. I received this product discounted
*by S***M on 26 November 2015*

All homes should have a smoke alarm as a matter of safety, several in fact and I did indeed already have 2 fitted. They were not wired to the mains and were battery operated, but the problem with battery operated smoke alarms is their limited battery life. What drew me immediately to this superb smoke alarm was the 10 year battery life! The unit comes complete with its own built in Lithium ion battery. That’s very impressive to say the least and leaves you feeling safe and secure once its fitted. Mine is now fitted upstairs and I know I don’t need to worry about its battery for a decade. Excellent!It arrives simply boxed and includes a comprehensive instruction leaflet that advises on how to fit it, where to fit it and also it ships with 2 screws and raw plugs to enable you to fit it.One thing I learnt when I read the instruction leaflet was that Photoelectric smoke alarms are better at detecting and alerting you to slow smouldering fires that smoulder for hours prior to bursting into flames. I felt extremely reassured by this information that prior to reading that leaflet, I didn’t even know!I like the fact also that the unit has an operating LED light which flashes every 53 seconds to confirm to you that the unit is working and protecting you and there is also a low battery warning alarm ( beeps every 40 seconds) which I haven’t actually heard as my unit is new but I’m glad its there so that when my alarm battery is running low I will be aware enough to do something about it rather than leaving me unprotected.I received this product discounted in order for a unbiased product review

## Frequently Bought Together

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-23*