---
product_id: 410860802
title: "Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up"
brand: "kidde"
price: "VT25376"
currency: VUV
in_stock: true
reviews_count: 5
category: "Kidde"
url: https://www.desertcart.vu/products/410860802-firex-kf20-optical-smoke-alarm-mains-operated-with-battery-back
store_origin: VU
region: Vanuatu
---

# Battery backup included Interlink up to 23 alarms Tamper-resistant locking Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up

**Brand:** kidde
**Price:** VT25376
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with Kidde KF20 — your home's silent guardian! 🏠

## Quick Answers

- **What is this?** Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up by kidde
- **How much does it cost?** VT25376 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/410860802-firex-kf20-optical-smoke-alarm-mains-operated-with-battery-back)

## 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

- • **Built to Last:** Tamper-resistant locking device for secure, tamper-proof installation
- • **Smart Silence Control:** Combined test/hush button for quick nuisance alarm management
- • **Certified Peace of Mind:** BSi Kitemark certified, compliant with latest building regulations
- • **Seamless Safety Network:** Link up to 23 alarms for whole-home protection
- • **Uninterrupted Vigilance:** Mains powered with battery backup ensures 24/7 reliability

## Overview

The Kidde Firex KF20 is a mains-operated optical smoke alarm with a 9V battery backup, designed to detect slow smouldering fires while minimizing false alarms. It supports interlinking up to 23 units, features a combined test/hush button, and includes a tamper-resistant locking device. Certified to BSi Kitemark standards and compliant with current building regulations, it offers reliable, professional-grade fire safety for modern homes.

## Description

Product Description Kidde Firex smoke alarms offer the very best in quality and reliability. Certified to the highest BSi Kitemark standards and offering a wide range of alarms to suit most applications you can be assured that you are in safe hands. The KF20 is compliant with the latest in building regulations for new housing. The KF20 utilises photo-electric (optical) detection facility. They are best suited where there is a danger of slow smouldering fires such as those caused by cigarettes for example on foam filled furniture or bedding. They are less prone to nuisance alarms caused by steam or cooking particles. They can be disposed of with general household waste. Set Contains: 1 x KF2, Battery & Instructions

Review: Je souhaite garder le produit donc vous pouvez ŕedebiter le montant de son prix
Review: Firs,t you need to check the regulations for your area. These directly exchange for for the older models if you have them (screw into existing baseplate) but would also not be too difficult to fit as new items - again, though, check if you can do this or whether you need a registered electrician,

## Features

- Interlink with up to 23 Firex hard-wired alarms
- Combined test/hush button
- Auto reset
- Tamper-resistant locking device
- Mains operation
- The Kidde KF2 smoke alarm is a mains powered alarm contains battery in it as a backup in case of a power cut.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006J56XQU |
| ASIN  | B006J56XQU |
| Alarm | Visual |
| Batteries  | 1 9V batteries required. (included) |
| Best Sellers Rank | #113,273 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #135 in Smoke Alarms |
| Brand | Kidde |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,468) |
| Customer reviews | 4.6 4.6 out of 5 stars (1,468) |
| Date First Available  | 9 August 2012 |
| Global Trade Identification Number | 00020967049737 |
| Is Discontinued By Manufacturer  | No |
| Item Part Number | KF2 |
| Item Type Name | Mains Optical Smoke Alarm |
| Item Weight | 280 Grams |
| Item model number  | KF2 |
| Manufacturer | Kidde |
| Manufacturer  | Kidde |
| Mfr Part Number | KF2 |
| Model Number | KF2 |
| Power Source | Battery Powered |
| Product Dimensions  | 13.3 x 13.3 x 3.9 cm; 280 g |
| Product Style | Back Up |
| Sensor Type | Photoelectric |
| UPC | 020967049737 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Kidde
- **Colour:** White
- **Item weight:** 280 Grams
- **Power source:** Battery Powered
- **Style:** Back Up

## Images

![Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up - Image 1](https://m.media-amazon.com/images/I/515CCoZk4qL.jpg)

## Customer Reviews

### ⭐⭐⭐ Review
*by E***S on 25 December 2020*

Je souhaite garder le produit donc vous pouvez ŕedebiter le montant de son prix

### ⭐⭐⭐⭐⭐ Review
*by U***K on 28 January 2026*

Firs,t you need to check the regulations for your area. These directly exchange for for the older models if you have them (screw into existing baseplate) but would also not be too difficult to fit as new items - again, though, check if you can do this or whether you need a registered electrician,

### ⭐⭐⭐⭐⭐ Review
*by A***N on 1 June 2017*

We recently had a 2 storey extension done and got the building regulation for approval. When the inspector arrived we were told we need to replace the existing battery operated smoke detector with the mains on both levels. With so many available in the market anything from £9 to even £300 depending on your pocket. So I read the reviews here and stumble upon the Firex Kidde Mains Powered Optical Smoke Alarm . The building reg inspector suggested the optical one's as opposed to the other ones available. Package Contents - 1x Mains operated smoke alarm 1x Installation manual 1x battery Set of screw fixings It comes with 3 wires attached to it , one being a interconnect. If the smoke alarm goes off the seconds one immediately kicks in at the same time. The inspector did the test and was very pleased with the installation. If you know how to install it, then ts very simple to do so. I am not familiar with the electrics so had to get a professional to install 2x smoke alarms for £80. We got 2 quotes for £200 for the installation. You can do a test by pressing the tiny button. The GREEN Led on the smoke alarm looks great too, not too bright or low either. Overall a great product and does a great job. I would highly recommend the product. I really hope you found my review helpful and would love for you to click on the “YES” button to say so. If you don't think my review has been helpful, before you click on the “NO“ button to say I was unhelpful, I would love you to leave me a comment with your thoughts, so I can try improving my future reviews

## Frequently Bought Together

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-16*